diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index ff179b1e7423..ec23d43d0c35 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -2320,6 +2320,7 @@ static int btrfs_bitmap_cluster(struct btrfs_block_group_cache *block_group,
 
 	if (!found) {
 		start = i;
+		cluster->max_size = 0;
 		found = true;
 	}