diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 4c316ca3e..34ffc1257 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -9905,6 +9905,7 @@ int btrfs_read_block_groups(struct btrfs_root *root)
 			btrfs_err(info,
 "bg %llu is a mixed block group but filesystem hasn't enabled mixed block groups",
 				  cache->key.objectid);
+			btrfs_put_block_group(cache);
 			ret = -EINVAL;
 			goto error;
 		}