diff --git a/sys/libkern/mcount.c b/sys/libkern/mcount.c
index e7105d0f8e1..ac79783372a 100644
--- a/sys/libkern/mcount.c
+++ b/sys/libkern/mcount.c
@@ -36,12 +36,15 @@
 static char sccsid[] = "@(#)mcount.c	8.1 (Berkeley) 6/4/93";
 #endif
 static const char rcsid[] =
-	"$Id: mcount.c,v 1.8 1996/08/28 20:15:12 bde Exp $";
+	"$Id: mcount.c,v 1.9 1996/10/17 19:32:25 bde Exp $";
 #endif
 
 #include <sys/param.h>
 #include <sys/gmon.h>
 #ifdef KERNEL
+#ifndef GUPROF
+#include <sys/systm.h>
+#endif
 #include <vm/vm.h>
 #include <vm/vm_param.h>
 #include <vm/pmap.h>