diff --git a/fastapi/_compat/v2.py b/fastapi/_compat/v2.py
index 8784d5afc..c5ac1f660 100644
--- a/fastapi/_compat/v2.py
+++ b/fastapi/_compat/v2.py
@@ -372,6 +372,7 @@ def get_model_fields(model: Type[BaseModel]) -> List[ModelField]:
         for name, field_info in model.model_fields.items()
     ]
 
+
 # Duplicate of several schema functions from Pydantic v1 to make them compatible with
 # Pydantic v2 and allow mixing the models
 
diff --git a/fastapi/datastructures.py b/fastapi/datastructures.py
index 3df81087b..34185b96a 100644
--- a/fastapi/datastructures.py
+++ b/fastapi/datastructures.py
@@ -11,7 +11,6 @@ from typing import (
 )
 
 from fastapi._compat import (
-    PYDANTIC_V2,
     CoreSchema,
     GetJsonSchemaHandler,
     JsonSchemaValue,
diff --git a/fastapi/encoders.py b/fastapi/encoders.py
index beab3e446..8ff7d58dd 100644
--- a/fastapi/encoders.py
+++ b/fastapi/encoders.py
@@ -25,7 +25,7 @@ from pydantic.networks import AnyUrl, NameEmail
 from pydantic.types import SecretBytes, SecretStr
 from typing_extensions import Annotated, Doc
 
-from ._compat import PYDANTIC_V2, Url, _is_undefined, _model_dump
+from ._compat import Url, _is_undefined, _model_dump
 
 
 # Taken from Pydantic v1 as is
diff --git a/tests/test_pydantic_v1_v2_multifile/main.py b/tests/test_pydantic_v1_v2_multifile/main.py
index d7095b551..90f525bba 100644
--- a/tests/test_pydantic_v1_v2_multifile/main.py
+++ b/tests/test_pydantic_v1_v2_multifile/main.py
@@ -113,4 +113,3 @@ def handle_v2_list_to_v1_item(data: List[modelsv2.Item]) -> modelsv1.Item:
             multi=[modelsv1.SubItem(name=s.new_sub_name) for s in item.new_multi],
         )
     return modelsv1.Item(title="", size=0, sub=modelsv1.SubItem(name=""))
-