diff --git a/Mac/Python/macmain.c b/Mac/Python/macmain.c
index 55f6f23..0ac81cb 100644
--- a/Mac/Python/macmain.c
+++ b/Mac/Python/macmain.c
@@ -48,8 +48,8 @@
 
 
 /* Subroutines that live in their own file */
-extern char *getversion();
-extern char *getcopyright();
+extern char *getversion Py_PROTO((void));
+extern char *getcopyright Py_PROTO((void));
 
 
 /* For getprogramname(); set by main() */