--- a/builtins.h
+++ b/builtins.h
@@ -20,4 +20,4 @@
 */
 #ident "$Id: builtins.h,v 1.4 2004/11/02 04:39:39 bediger Exp $"
 void setup_builtins(void);
-int primitive_call_counter;
+extern int primitive_call_counter;