Index: src/ch/af_defs.h
===================================================================
diff -u -N -r3493e9fc470285b0a0b417d50be281467a071eb7 -r66e9ad9a512cec46d691cb1ba012424dc7ac8897
--- src/ch/af_defs.h	(.../af_defs.h)	(revision 3493e9fc470285b0a0b417d50be281467a071eb7)
+++ src/ch/af_defs.h	(.../af_defs.h)	(revision 66e9ad9a512cec46d691cb1ba012424dc7ac8897)
@@ -23,6 +23,6 @@
 #define IMID_LOGFILE			0x0001000000000002
 
 // callbacks
-typedef (*PFNNOTIFYCALLBACK)(ULONGLONG, UINT, WPARAM, LPARAM);
+typedef void(*PFNNOTIFYCALLBACK)(ULONGLONG, UINT, WPARAM, LPARAM);
 
 #endif
\ No newline at end of file