diff --git a/contrib/cvs/src/classify.c b/contrib/cvs/src/classify.c
index bae2a9b6256..28d7263e2a1 100644
--- a/contrib/cvs/src/classify.c
+++ b/contrib/cvs/src/classify.c
@@ -12,6 +12,9 @@
  * 
  */
 
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
 #include "cvs.h"
 
 static void sticky_ck PROTO ((struct file_info *finfo, int aflag,