AMENDMENT TO

                                                                Exhibit (d)(133)

                                  AMENDMENT TO

                              JANUS INVESTMENT FUND

                             SUB-ADVISORY AGREEMENT

                         INTECH RISK-MANAGED STOCK FUND

      THIS AMENDMENT is made this 9th day of December, 2008, between JANUS
CAPITAL MANAGEMENT LLC, a Delaware limited liability company ("Janus"), and
INTECH INVESMENT MANAGEMENT, LLC (formerly known as ENHANCED INVESTMENT
TECHNOLOGIES, LLC), a Delaware limited liability company ("INTECH").

                                   WITNESSETH

      WHEREAS, Janus and INTECH are parties to a Sub-Advisory Agreement on
behalf of INTECH Risk-Managed Stock Fund (the "Fund"), a series of Janus
Investment Fund (the "Trust"), dated July 1, 2004, and amended January 1, 2006,
February 28, 2006 and January 1, 2008 (the "Agreement");

      WHEREAS, the parties desire to amend the Agreement as set forth in greater
detail below;

      WHEREAS, pursuant to Section 11 of the Agreement, any amendment to the
Agreement is subject to approval by (i) a majority of the Trustees, including a
majority of the Trustees who are not interested persons (as that phrase is
defined in Section 2(a)(19) of the 0000 Xxx) of the Trust or Janus, INTECH or
their affiliates, and (ii) if required by applicable law, by the affirmative
vote of a majority of the outstanding voting securities of the Fund (as that
phrase is defined in Section 2(a)(42) of the 1940 Act);

      WHEREAS, the parties have obtained Trustee approval as set forth above,
and the parties agree that a shareholder vote is not required to amend the
Agreement; and

      WHEREAS, Enhanced Investment Technologies, LLC has changed its name to
INTECH Investment Management, LLC.

      NOW, THEREFORE, in consideration of the premises and of the mutual
agreements set forth below, the parties agree to amend the Agreement as follows:

      1. All references to Enhanced Investment Technologies, LLC are deleted and
replaced with INTECH Investment Management, LLC.

      2. The parties acknowledge that the Agreement, as amended, remains in full
force and effect as of the date of this Amendment, and that this Amendment,
together with the

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Agreement and any prior amendments, contains the entire understanding and the
full and complete agreement of the parties and supercedes and replaces any prior
understandings and agreements among the parties respecting the subject matter
hereof.

      3. This Amendment may be contemporaneously executed in two or more
counterparts, each of which shall be deemed an original but all of which
together shall constitute one and the same instrument.

      IN WITNESS WHEREOF, the parties have caused their duly authorized officers
to execute this Amendment as of the date first above written.

                                       JANUS CAPITAL MANAGEMENT LLC

                                       By: /s/ Xxxxxxxxx Xxxxxxxxxx-Xxxxxx
                                           -------------------------------------
                                       Name:  Xxxxxxxxx Xxxxxxxxxx-Xxxxxx
                                       Title: Vice President

                                       INTECH INVESTMENT MANAGEMENT, LLC

                                       By: /s/ Xxxxxx Xxxxxx
                                           -------------------------------------
                                       Name: Xxxxxx Xxxxxx
                                       Title: VP and General Counsel

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