diff --git a/include/global.h b/include/global.h
index 42687f340..be3a78a67 100644
--- a/include/global.h
+++ b/include/global.h
@@ -44,7 +44,10 @@
 extern int __cntlzw(uint);
 extern int __rlwimi(int, int, int, int, int);
 extern void __dcbz(void*, int);
+
+#ifndef __MWERKS__
 extern void __sync();
+#endif
 
 #define VERSION_JPN 0
 #define VERSION_USA 1