diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index f8b054898885..04ca0a4075b6 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -1296,7 +1296,9 @@ int btrfs_quota_disable(struct btrfs_fs_info *fs_info)
 		goto out;
 	}
 
+	spin_lock(&fs_info->trans_lock);
 	list_del(&quota_root->dirty_list);
+	spin_unlock(&fs_info->trans_lock);
 
 	btrfs_tree_lock(quota_root->node);
 	btrfs_clean_tree_block(quota_root->node);