diff --git a/fsspec/implementations/reference.py b/fsspec/implementations/reference.py
index d5d3f2968..3a175352a 100644
--- a/fsspec/implementations/reference.py
+++ b/fsspec/implementations/reference.py
@@ -5,8 +5,8 @@
 import logging
 import math
 import os
-from itertools import chain
 from functools import lru_cache
+from itertools import chain
 from typing import TYPE_CHECKING, Literal
 
 import fsspec.core
diff --git a/pyproject.toml b/pyproject.toml
index 48368711f..8b3606a00 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -162,6 +162,7 @@ select = [
     "E9",
     "F",
     "FURB",
+    "I",
     "LOG",
     "PERF",
     "PLC",