diff --git a/lib/framework/frame.h b/lib/framework/frame.h
index 5418b5c67..c41755cc1 100644
--- a/lib/framework/frame.h
+++ b/lib/framework/frame.h
@@ -104,7 +104,13 @@ extern UDWORD HashString( const char *String );
 extern UDWORD HashStringIgnoreCase( const char *String );
 
 #if defined(WZ_OS_WIN)
-struct timeval;
+struct timeval
+{
+	long tv_sec;
+	long tv_usec;
+};
+
+struct timezone;
 extern int gettimeofday(struct timeval* tv, struct timezone* tz);
 #endif