diff --git a/revision.c b/revision.c
index 8140561b6c7..cddd0542a65 100644
--- a/revision.c
+++ b/revision.c
@@ -316,9 +316,10 @@ static void add_pending_object_with_path(struct rev_info *revs,
 		revs->no_walk = 0;
 	if (revs->reflog_info && obj->type == OBJ_COMMIT) {
 		struct strbuf buf = STRBUF_INIT;
-		int len = interpret_branch_name(name, 0, &buf, &options);
+		size_t namelen = strlen(name);
+		int len = interpret_branch_name(name, namelen, &buf, &options);
 
-		if (0 < len && name[len] && buf.len)
+		if (0 < len && len < namelen && buf.len)
 			strbuf_addstr(&buf, name + len);
 		add_reflog_for_walk(revs->reflog_info,
 				    (struct commit *)obj,