diff --git a/contrib/gcc/config/freebsd-spec.h b/contrib/gcc/config/freebsd-spec.h
index cc9d0423d98..a58788ad3c9 100644
--- a/contrib/gcc/config/freebsd-spec.h
+++ b/contrib/gcc/config/freebsd-spec.h
@@ -55,7 +55,8 @@ Boston, MA 02110-1301, USA.  */
     {									\
 	builtin_define_with_int_value ("__FreeBSD__", FBSD_MAJOR);	\
 	builtin_define_std ("unix");					\
-	builtin_define ("__KPRINTF_ATTRIBUTE__");		       	\
+	builtin_define_std ("__unix__");				\
+	builtin_define ("__KPRINTF_ATTRIBUTE__");			\
 	builtin_assert ("system=unix");					\
 	builtin_assert ("system=bsd");					\
 	builtin_assert ("system=FreeBSD");				\