diff --git a/tests/test_arbitrary_types.py b/tests/test_arbitrary_types.py
index 8b8417bae..e5fa95ef2 100644
--- a/tests/test_arbitrary_types.py
+++ b/tests/test_arbitrary_types.py
@@ -1,9 +1,10 @@
-from typing import Annotated
+from typing import List
 
 import pytest
 from fastapi import FastAPI
 from fastapi.testclient import TestClient
 from inline_snapshot import snapshot
+from typing_extensions import Annotated
 
 from .utils import needs_pydanticv2
 
@@ -24,7 +25,7 @@ def get_client():
 
     FakeNumpyArrayPydantic = Annotated[
         FakeNumpyArray,
-        WithJsonSchema(TypeAdapter(list[float]).json_schema()),
+        WithJsonSchema(TypeAdapter(List[float]).json_schema()),
         PlainSerializer(lambda v: v.data),
     ]
 
@@ -65,7 +66,7 @@ def test_typeadapter():
 
     FakeNumpyArrayPydantic = Annotated[
         FakeNumpyArray,
-        WithJsonSchema(TypeAdapter(list[float]).json_schema()),
+        WithJsonSchema(TypeAdapter(List[float]).json_schema()),
         PlainSerializer(lambda v: v.data),
     ]