Exch Database offline Defrag

I have a server with C, D, E and F partition. Exchange is installed on D, Logs files on E and the DB on F. I tried offline defrag on one storage group on F. However, the defrag failed because the Temp file was created on the D where there is no enough space. How do I make the defrag to use the F partition where the database resides?
Thank
Tobi