diff --git a/pack-objects.c b/pack-objects.c
index 8de7bd0344..68c7e592b5 100644
--- a/pack-objects.c
+++ b/pack-objects.c
@@ -321,6 +321,7 @@ static int try_delta(struct unpacked *cur, struct unpacked *old)
 		}
 	}
 	free(delta_buf);
+	return 0;
 }
 
 static void find_deltas(struct object_entry **list, int window)