diff --git a/Include/sysmodule.h b/Include/sysmodule.h
index f79ecdba674..29d1455130c 100644
--- a/Include/sysmodule.h
+++ b/Include/sysmodule.h
@@ -28,3 +28,5 @@ object *sysget PROTO((char *));
 int sysset PROTO((char *, object *));
 FILE *sysgetfile PROTO((char *, FILE *));
 void initsys PROTO((void));
+
+extern object *sys_trace, *sys_profile;