diff --git a/src/msw/utils.cpp b/src/msw/utils.cpp
index e8cc1ac459..1dcebf9bcc 100644
--- a/src/msw/utils.cpp
+++ b/src/msw/utils.cpp
@@ -322,7 +322,7 @@ void wxBell(void)
 //#ifdef __WIN32__
 //  Beep(1000,1000) ; // 1kHz during 1 sec.
 //#else
-  MessageBeep(-1) ;
+  MessageBeep((UINT)-1) ;
 //#endif
 }