change direction of walk.

Hi, Quick question. I have set up a walkcycle for a character. Have keyframed the master bones location to move the character ahead at the right speed. In NLA I use the master bone as offset bone and it works perfectly.

However, the character is walking in the global Y direction. I want him to to walk in the global X direction. Is there a way I can change the direction my character walks in whithout modifying the walkcycle action?