1 files changed, 2 insertions, 0 deletions
diff --git a/builtin/grep.c b/builtin/grep.c
index e8f0f92cf7..159e65d47a 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -821,6 +821,8 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
 		/* Is it a rev? */
 		if (!get_sha1(arg, sha1)) {
 			struct object *object = parse_object_or_die(sha1, arg);
+			if (!seen_dashdash)
+				verify_non_filename(prefix, arg);
 			add_object_array(object, arg, &list);
 			continue;
 		}