diff --git a/pack-bitmap.c b/pack-bitmap.c
index 6ff23f096d..107fc35fb2 100644
--- a/pack-bitmap.c
+++ b/pack-bitmap.c
@@ -506,15 +506,16 @@ static int open_pack_bitmap(struct repository *r,
 static int open_midx_bitmap(struct repository *r,
 			    struct bitmap_index *bitmap_git)
 {
+	int ret = -1;
 	struct multi_pack_index *midx;
 
 	assert(!bitmap_git->map);
 
 	for (midx = get_multi_pack_index(r); midx; midx = midx->next) {
 		if (!open_midx_bitmap_1(bitmap_git, midx))
-			return 0;
+			ret = 0;
 	}
-	return -1;
+	return ret;
 }
 
 static int open_bitmap(struct repository *r,