Volume rolloff: Distance to listener not changing.

I dont know if its a bug or not, but here is my problem:

Situation:

I have a FPS controller with an audio listener attached

and a moving object with an audio source attached.

Problem:

When the FPS controller isnt moving and the other object is,

the sound-volume is not changing, although the source is moving away.

But when I move the FPS controller it seems like the distance between controller

and moving object is updating.

Also you can see that in the 3d settings of the source:

(Im using Unity 5.0.0f4)

So is there any whay to solve this?

Thanks