diff --git a/contrib/diff/sdiff.c b/contrib/diff/sdiff.c
index 08673d89b39b..5b5759ededcd 100644
--- a/contrib/diff/sdiff.c
+++ b/contrib/diff/sdiff.c
@@ -19,10 +19,8 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 
 /* GNU SDIFF was written by Thomas Lord. */
 
-#ifndef lint
-static const char rcsid[] =
-"$FreeBSD$";
-#endif
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
 
 #include "system.h"
 #include <stdio.h>