diff --git a/include/tradstdc.h b/include/tradstdc.h
index b7292d1b8..0c6076a7e 100644
--- a/include/tradstdc.h
+++ b/include/tradstdc.h
@@ -204,7 +204,7 @@ typedef genericptr genericptr_t;	/* (void *) or (char *) */
 #define UNWIDENED_PROTOTYPES
 #endif
 #if defined(macintosh) && (defined(__SC__) || defined(__MRC__))
-#define UNWIDENED_PROTOTYPES
+#define WIDENED_PROTOTYPES
 #endif
 #if defined(__MWERKS__) && defined(__BEOS__)
 #define UNWIDENED_PROTOTYPES