THIRD AMENDING AGREEMENT

Exhibit 99.1

Execution Version

THIRD AMENDING AGREEMENT

THIS AGREEMENT is made as of May 25, 2015

BETWEEN:

BAYTEX ENERGY CORP., a corporation amalgamated under the laws of the Province of Alberta (hereinafter referred to as the "Canadian Borrower"), and BAYTEX ENERGY USA, INC., a Delaware corporation (hereinafter referred to as the "U.S. Borrower" and together with the Canadian Borrower, collectively, the "Borrowers" and, individually, a "Borrower"),

OF THE FIRST PART,

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THE BANK OF NOVA SCOTIA,

CANADIAN IMPERIAL BANK OF COMMERCE,

ROYAL BANK OF CANADA,

THE TORONTO-DOMINION BANK,

TORONTO DOMINION (NEW YORK) LLC,

BANK OF MONTREAL,

BANK OF MONTREAL, CHICAGO BRANCH,

NATIONAL BANK OF CANADA,

UNION BANK, CANADA BRANCH,

MUFG UNION BANK, N.A. (formerly named, UNION BANK, N.A.),

ALBERTA TREASURY BRANCHES,

BANK OF AMERICA, N.A., CANADA BRANCH,

BARCLAYS BANK PLC,

CAISSE CENTRALE XXXXXXXXXX,

XXXXXX CENTRALE XXXXXXXXXX US BRANCH,

XXXXX FARGO BANK, N.A., CANADIAN BRANCH and

SOCIÉTÉ GÉNÉRALE
(hereinafter referred to collectively as the "Lenders" and individually as a "Lender"),

OF THE SECOND PART,

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THE BANK OF NOVA SCOTIA, a Canadian chartered bank, as agent of the Lenders (hereinafter referred to as the "Agent"),

OF THE THIRD PART.

WHEREAS the parties hereto have agreed to amend and supplement certain provisions of the Credit Agreement as hereinafter set forth;

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NOW THEREFORE THIS AGREEMENT WITNESSES that in consideration of the covenants and agreements herein contained and other good and valuable consideration, the receipt and sufficiency of which are hereby conclusively acknowledged by each of the parties hereto, the parties hereto covenant and agree as follows:

1. Interpretation

1.1.    In this Agreement and the recitals hereto, unless something in the subject matter or context is inconsistent therewith:

"Agreement" means this agreement, as amended, modified, supplemented or restated from time to time.

"Credit Agreement" means the credit agreement made as of June 4, 2014 between the Borrowers, the Lenders and the Agent, as further amended, modified and supplemented to the date hereof.

1.2.    Capitalized terms used herein without express definition shall have the same meanings herein as are ascribed thereto in the Credit Agreement.

1.3.    The division of this Agreement into Sections and the insertion of headings are for convenience of reference only and shall not affect the construction or interpretation of this Agreement. Unless the context otherwise requires, references herein to "Sections" are to Sections of this Agreement. The terms "this Agreement", "hereof", "hereunder" and similar expressions refer to this Agreement and not to any particular Section or other portion hereof and include any agreements supplemental hereto.

1.4.    This Agreement shall be governed by and construed in accordance with the laws of the Province of Alberta and the federal laws of Canada applicable therein.

1.5.    The following schedules are annexed hereto and are incorporated by reference and deemed to be part hereof:

Schedule A – Lenders and Commitments; and

Schedule B – Form of Confirmation of Guarantee.

2. Amendments and Supplements

2.1.    Extension of Maturity Dates. Each of the Revolving Syndicated Facility Maturity Date, the Operating Facility Maturity Date and the U.S. Facility Maturity Date is hereby extended to June 4, 2019, without derogating from the right of the Borrowers to further extend such date with respect to a given Lender in accordance with Sections 2.19, 2.20 or 2.21, as applicable, of the Credit Agreement.

2.2.    New Schedule A. Schedule A to the Credit Agreement is hereby deleted in its entirety and replaced with Schedule A attached hereto to update such Schedule A to reflect the assignments made on May 21, 2015 to certain Lenders of all of the outstanding Loans and other Obligations owing

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by the Canadian Borrower to a Former Lender under the Revolving Syndicated Facility and the assignments made on May 21, 2015 to certain Lenders of all of such Former Lender's Revolving Syndicated Facility Commitments.

3. Fees

3.1.    Extension Fee in Respect of the Revolving Syndicated Facility and the Operating Facility. The Canadian Borrower hereby agrees to pay to the Agent, for each Lender, an extension fee in Canadian Dollars in an amount equal to [fee has been redacted] of the aggregate amount of each such Lender's Commitments under the Revolving Syndicated Facility and the Operating Facility, in each case, in effect after giving effect hereto.

3.2.    Extension Fee in Respect of the U.S. Facility. The U.S. Borrower hereby agrees to pay to the Agent, for each U.S. Facility Lender, an extension fee in United States Dollars in an amount equal to [fee has been redacted] of the aggregate amount of each such U.S. Facility Lender's U.S. Facility Commitments under the U.S. Facility in effect after giving effect hereto.

4. Representations and Warranties

Each Borrower (in the case of the U.S. Borrower, with respect to subparagraphs (a), (b), (c) and (e) of this Section 4 only) hereby represents and warrants as follows to each Lender and the Agent and acknowledges and confirms that each Lender and the Agent is relying upon such representations and warranties:

(a) Capacity, Power and Authority

(i) It is duly amalgamated or incorporated, as the case may be, and is validly subsisting under the laws of its jurisdiction of amalgamation or incorporation, as the case may be, and has all the requisite corporate capacity, power and authority to carry on its business as presently conducted and to own its property; and

(ii) It has the requisite corporate capacity, power and authority to execute and deliver this Agreement.

(b) Authorization; Enforceability

It has taken or caused to be taken all necessary action to authorize, and has duly executed and delivered, this Agreement, and this Agreement is a legal, valid and binding obligation of it enforceable against it in accordance with its terms, subject to applicable bankruptcy, reorganization, winding up, insolvency, moratorium or other laws of general application affecting the enforcement of creditors' rights generally and to the equitable and statutory powers of the courts having jurisdiction with respect thereto.

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(c) Compliance with Other Instruments

The execution, delivery and performance by it of this Agreement and the consummation of the transactions contemplated herein do not conflict with, result in any breach or violation of, or constitute a default under the terms, conditions or provisions of its articles, by-laws or other constating documents or any unanimous shareholder agreement relating to it, or of any law, regulation, judgment, decree or order binding on or applicable to it or to which its property is subject or of any material agreement, lease, licence, permit or other instrument to which it or any of its Subsidiaries is a party or is otherwise bound or by which any of them benefits or to which any of their property is subject and do not require the consent or approval of any Governmental Authority or any other party.

(d) Credit Agreement Representations and Warranties

Each of the representations and warranties of the Canadian Borrower set forth in Section 9.1 of the Credit Agreement is true and accurate in all respects as of the date hereof other than any such representations and warranties which expressly speak of an earlier date.

(e) No Default

No Default or Event of Default has occurred or is continuing or shall result from or exist immediately after the coming into effect of the amendments and supplements to the Credit Agreement contemplated hereby.

The representations and warranties set out in this Agreement shall survive the execution and delivery of this Agreement and the making of each Drawdown, notwithstanding any investigations or examinations which may be made by or on behalf of the Agent, the Lenders or Lenders' Counsel. Such representations and warranties shall survive until the Credit Agreement has been terminated.

5. Conditions Precedent

The amendments and supplements to the Credit Agreement contained herein shall be effective upon, and shall be subject to, the satisfaction of the following conditions precedent:

(a) the Borrowers shall have paid to the Agent, for each Lender and U.S. Facility Lender, as the case may be, the fees required to be paid pursuant to Section 3 hereof;

(b) each Guarantor (other than the Baytex LuxCos which shall deliver the same by no later than June 30, 2015 pursuant to Section 6 hereof) shall have executed and delivered to the Agent on behalf of the Lenders a Confirmation of Guarantee in the form attached hereto as Schedule B; and

(c) no Default or Event of Default shall have occurred and be continuing or shall result from or exist immediately after the coming into effect of the amendments and supplements to the Credit Agreement contemplated hereby.

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The foregoing conditions precedent are inserted for the sole benefit of the Lenders and the Agent and may be waived in writing by the Lenders, in whole or in part (with or without terms and conditions).

6. Covenant in Respect of the Baytex LuxCos' Delivery of Confirmations of Guarantee

The Canadian Borrower shall (unless otherwise consented to by the Lenders in accordance with the Credit Agreement), by no later than June 30, 2015, have caused each Baytex LuxCo to have executed and delivered to the Agent on behalf of the Lenders a Confirmation of Guarantee in the form attached hereto as Schedule B, failing which, and notwithstanding any other provision hereof or in the Credit Agreement (as amended and supplemented by this Agreement) to the contrary, an Event of Default shall be deemed to exist under the Credit Agreement (as amended and supplemented by this Agreement).

7. Confirmation of Credit Agreement and other Documents

The Credit Agreement and the other Documents to which the Borrowers are a party and all covenants, terms and provisions thereof, except as expressly amended and supplemented by this Agreement, shall be and continue to be in full force and effect and the Credit Agreement as amended and supplemented by this Agreement and each of the other Documents to which the Borrowers are a party is hereby ratified and confirmed and shall from and after the date hereof continue in full force and effect as herein amended and supplemented, with such amendments and supplements being effective from and as of the date hereof upon satisfaction of the conditions precedent set forth in Section 5 hereof.

8. Further Assurances

The parties hereto shall from time to time do all such further acts and things and execute and deliver all such documents as are required in order to effect the full intent of and fully perform and carry out the terms of this Agreement.

9. Enurement

This Agreement shall enure to the benefit of and shall be binding upon the parties hereto and their respective successors and permitted assigns.

10. Counterparts

This Agreement may be executed in any number of counterparts, each of which shall be deemed to be an original and all of which taken together shall be deemed to constitute one and the same instrument, and it shall not be necessary in making proof of this Agreement to produce or account for more than one such counterpart. Such executed counterparts may be delivered by facsimile or other electronic transmission and, when so delivered, shall constitute a binding agreement of the parties hereto.

IN WITNESS WHEREOF the parties hereto have executed this Agreement.

		BAYTEX ENERGY CORP.
		By:	("Signed")
			Xxxxxx X. Xxxx Chief Financial Officer
		By:	("Signed")
			Xxxxxx Xxxxxxxxxx Vice President, General Counsel and Corporate Secretary

Signature Page to the Third Amending Agreement

		BAYTEX ENERGY USA, INC.
		By:	("Signed")
			Xxxxxxx X. Xxxxx Vice President - Land
		By:	("Signed")
			Xxxxxxx X. Xxxxxx Vice President and Secretary

Signature Page to the Third Amending Agreement

		AGENT:
		THE BANK OF NOVA SCOTIA, in its capacity as the Agent
		By:		("Signed")
		Name:
		Title:

Signature Page to the Third Amending Agreement

		LENDERS:
		THE BANK OF NOVA SCOTIA, in its capacity as Lender under the Revolving Syndicated Facility, as U.S. Facility Lender and as the Operating Lender
		By:	("Signed")
			Name:
			Title:
		By:	("Signed")
			Name:
			Title:

Signature Page to the Third Amending Agreement

		CANADIAN IMPERIAL BANK OF COMMERCE, in its capacity as Lender under the Revolving Syndicated Facility and as U.S. Facility Lender
		By:	("Signed")
			Name:
			Title:
		By:	("Signed")
			Name:
			Title:

Signature Page to the Third Amending Agreement

		ROYAL BANK OF CANADA, in its capacity as Lender under the Revolving Syndicated Facility and as U.S. Facility Lender
		By:	("Signed")
			Name:
			Title:
		By:
			Name:
			Title:

Signature Page to the Third Amending Agreement

		THE TORONTO-DOMINION BANK, in its capacity as Lender under the Revolving Syndicated Facility
		By:	("Signed")
			Name:
			Title:
		By:	("Signed")
			Name:
			Title:

Signature Page to the Third Amending Agreement

		TORONTO DOMINION (NEW YORK) LLC, in its capacity as U.S. Facility Lender
		By:	("Signed")
			Name:
			Title:
		By:
			Name:
			Title:

Signature Page to the Third Amending Agreement

		BANK OF MONTREAL, in its capacity as Lender under the Revolving Syndicated Facility
		By:	("Signed")
			Name:
			Title:
		By:	("Signed")
			Name:
			Title:

Signature Page to the Third Amending Agreement

		BANK OF MONTREAL, CHICAGO BRANCH, in its capacity as U.S. Facility Lender
		By:	("Signed")
			Name:
			Title:
		By:
			Name:
			Title:

Signature Page to the Third Amending Agreement

		NATIONAL BANK OF CANADA, in its capacity as Lender under the Revolving Syndicated Facility and as U.S. Facility Lender
		By:	("Signed")
			Name:
			Title:
		By:	("Signed")
			Name:
			Title:

Signature Page to the Third Amending Agreement

		UNION BANK, CANADA BRANCH, in its capacity as Lender under the Revolving Syndicated Facility
		By:	("Signed")
			Name:
			Title:
		By:
			Name:
			Title:

Signature Page to the Third Amending Agreement

		MUFG UNION BANK, N.A., in its capacity as U.S. Facility Lender
		By:	("Signed")
			Name:
			Title:
		By:
			Name:
			Title:

Signature Page to the Third Amending Agreement

		ALBERTA TREASURY BRANCHES, in its capacity as Lender under the Revolving Syndicated Facility
		By:	("Signed")
			Name:
			Title:
		By:	("Signed")
			Name:
			Title:

Signature Page to the Third Amending Agreement

		BANK OF AMERICA, N.A., CANADA BRANCH, in its capacity as Lender under the Revolving Syndicated Facility and as U.S. Facility Lender
		By:	("Signed")
			Name:
			Title:
		By:
			Name:
			Title:

Signature Page to the Third Amending Agreement

		BARCLAYS BANK PLC, in its capacity as Lender under the Revolving Syndicated Facility and as U.S. Facility Lender
		By:	("Signed")
			Name:
			Title:
		By:
			Name:
			Title:

Signature Page to the Third Amending Agreement

		CAISSE CENTRALE XXXXXXXXXX, in its capacity as Lender under the Revolving Syndicated Facility
		By:	("Signed")
			Name:
			Title:
		By:	("Signed")
			Name:
			Title:

Signature Page to the Third Amending Agreement

		CAISSE CENTRALE XXXXXXXXXX US BRANCH, in its capacity as U.S. Facility Lender
		By:	("Signed")
			Name:
			Title:

Signature Page to the Third Amending Agreement

		XXXXX FARGO BANK, N.A., CANADIAN BRANCH, in its capacity as Lender under the Revolving Syndicated Facility and as U.S. Facility Lender
		By:	("Signed")
			Name:
			Title:
		By:
			Name:
			Title:

Signature Page to the Third Amending Agreement

		SOCIÉTÉ GÉNÉRALE, in its capacity as Lender under the Revolving Syndicated Facility and as U.S. Facility Lender
		By:	("Signed")
			Name:
			Title:
		By:
			Name:
			Title:

Signature Page to the Third Amending Agreement

SCHEDULE A

LENDERS AND COMMITMENTS

Lender	Operating Facility Commitment	Revolving Syndicated Facility Commitment	U.S. Facility Commitment
The Bank of Nova Scotia	[Redacted] [Redacted]
Canadian Imperial Bank of Commerce
Royal Bank of Canada
(a) The Toronto-Dominion Bank (b) Toronto Dominion (New York) LLC
(a) Bank of Montreal (b) Bank of Montreal, Chicago Branch
National Bank of Canada
(a) Union Bank, Canada Branch (b) Union Bank, N.A.
Alberta Treasury Branches
Bank of America, N.A., Canada Branch
Barclays Bank PLC

Lender	Operating Facility Commitment	Revolving Syndicated Facility Commitment	U.S. Facility Commitment
(a) Caisse centrale Xxxxxxxxxx (b) Xxxxxx centrale Xxxxxxxxxx US Branch
Xxxxx Fargo Bank, N.A., Canadian Branch
Société Générale
Total:	Cdn.$50,000,000	Cdn.$950,000,000	U.S.$200,000,000

Fronting Lender	Individual Fronting Limit
The Bank of Nova Scotia	[Redacted]
The Toronto-Dominion Bank	[Redacted]

SCHEDULE B

FORM OF CONFIRMATION OF GUARANTEE

CONFIRMATION OF GUARANTEE

TO:	The Lenders, the Hedging Affiliates and the Cash Managers
AND TO:	The Bank of Nova Scotia, as agent of the Lenders (the "Agent")

WHEREAS Baytex Energy Corp. (the "Canadian Borrower") and Baytex Energy USA, Inc. (the "U.S. Borrower" and together with the Canadian Borrower, collectively, the "Borrowers") are party to a credit agreement made as of June 4, 2014, between the Borrowers, the Lenders and the Agent (as amended and supplemented to the date hereof, the "Credit Agreement");

AND WHEREAS [each of] the undersigned guaranteed (a) all of the Obligations of each Borrower under, pursuant or relating to the Credit Agreement and the other Documents, (b) all of the Lender Financial Instrument Obligations and (c) all of the Cash Management Obligations (collectively, the "Guaranteed Obligations"), in each case, pursuant to [a] OR [the] guarantee made as of [June 4, 2014 OR June 11, 2014 OR July 25, 2014][, as the case may be] ([each, a] OR [the] "Guarantee" [and, collectively, the "Guarantees"]) granted by [each of] the undersigned [(or, in the case of Baytex Energy Ltd., by each of its amalgamation predecessors, Baytex Energy Ltd. and Baytex Finance Company Ltd.)] in favour of the Agent, the Lenders, the Hedging Affiliates and the Cash Managers;

AND WHEREAS, pursuant to a third amending agreement (the "Third Amending Agreement") made as of the date hereof, the Borrowers, the Lenders and the Agent have agreed to amend and supplement the Credit Agreement;

AND WHEREAS [each of] the undersigned has been provided with a true, correct and complete copy of the Third Amending Agreement;

AND WHEREAS [each of] the undersigned wishes to confirm to the Agent, the Lenders, the Hedging Affiliates and the Cash Managers that the Guarantee[s] continue[s] to apply to the Guaranteed Obligations.

IN CONSIDERATION of the sum of Cdn.$10.00 now paid by the Agent, the Lenders, the Hedging Affiliates and the Cash Managers to [each of] the undersigned and other good and valuable consideration (the receipt and sufficiency of which are hereby conclusively acknowledged), [each of] the undersigned hereby confirms and agrees that [each of] the Guarantee[s] is and shall remain in full force and effect in all respects notwithstanding the amendment of the Credit Agreement and the amendments and supplements contained in the Third Amending Agreement and shall continue to exist and apply to all of the Guaranteed Obligations, including, without limitation, the Guaranteed Obligations of the Borrowers under, pursuant or relating to the Credit Agreement as

amended by the Third Amending Agreement. This Confirmation is in addition to and shall not limit, derogate from or otherwise affect any provisions of the Guarantee[s] including, without limitation, Article 2 and Article 3 of [each] OR [the] Guarantee.

Capitalized terms used herein without express definition shall have the same meanings herein as are ascribed thereto in the Credit Agreement as amended by the Third Amending Agreement, as the context requires.

DATED as of May 25, 2015.

[INSERT APPLICABLE MATERIAL SUBSIDIARY OR MATERIAL SUBSIDIARIES]

[each of the foregoing by the undersigned:]

By:

Name:

Title:

By:

Name:

Title: