diff --git a/usr.bin/yacc/skeleton.c b/usr.bin/yacc/skeleton.c
index 6beccf59df7d..c8d705eb1194 100644
--- a/usr.bin/yacc/skeleton.c
+++ b/usr.bin/yacc/skeleton.c
@@ -60,8 +60,9 @@ __FBSDID("$FreeBSD$");
 const char *banner[] =
 {
     "#ifndef lint",
+    "#include <sys/cdefs.h>",
     "static char const ",
-    "yyrcsid[] = \"$FreeBSD$\";",
+    "yyrcsid[] __unused = \"$FreeBSD$\";",
     "#endif",
     "#include <stdlib.h>",
     "#define YYBYACC 1",