Compile error with filter function

Hello,

I've just switched from CodeWarrior 9 to 10 and am getting the
following compile error.  It didn't occur with CW 9.

	Error   : function call '[VoCompApp].NewNavObjectFilterUPP(pascal
unsigned char (*)(AEDesc *, void *, void *, short))' does not match
	'NewNavObjectFilterUPP(pascal extern "C" unsigned char (*)(AEDesc *,
void *, void *, short))'

I've declared my filter function as follows:

	static pascal Boolean MyFileFilter(AEDesc *theItem, void *info, void
*callBackUD, NavFilterModes filterMode) {...}

I've created the function pointer as follows:

	g_FilterProc = NewNavObjectFilterUPP((pascal Boolean (*) (AEDesc *,
void *, void *, NavFilterModes))MyFileFilter);

Any help would be appreciated.

Thanks,

Brian