Index: ext/libicpf/src/cfg.h
===================================================================
diff -u -N -rc53cff389f468ccd962ceeea6c1f45da58a49258 -r5be423928caafba015f46861cebb10cf0a1bb9ce
--- ext/libicpf/src/cfg.h	(.../cfg.h)	(revision c53cff389f468ccd962ceeea6c1f45da58a49258)
+++ ext/libicpf/src/cfg.h	(.../cfg.h)	(revision 5be423928caafba015f46861cebb10cf0a1bb9ce)
@@ -248,7 +248,7 @@
 #ifdef USE_ENCRYPTION
 	string m_strPassword;					///< Password to encrypt/decrypt properties with
 #endif
-	callback2<ptr_t, ulong_t, ptr_t> m_clbPropertyChanged;	///< Callback (callback1) which is executed when any property has changed
+	callback2<void, ulong_t, ptr_t> m_clbPropertyChanged;	///< Callback (callback2) which is executed when any property has changed
 															// First param is count of properties changed (-1 if all changed), second one the prop_group* (or NULL if none changed)
 };