diff --git a/fastapi/_compat/_v1_params.py b/fastapi/_compat/_v1_params.py
index 24c5d792f..8fb6b8aa3 100644
--- a/fastapi/_compat/_v1_params.py
+++ b/fastapi/_compat/_v1_params.py
@@ -1,4 +1,4 @@
-# mypy: ignore-errors
+# mypy: disable-error-code=no-untyped-def,no-untyped-call,arg-type,call-arg,attr-defined,valid-type
 # path: fastapi/_compat/_v1_params.py
 
 """
@@ -14,7 +14,7 @@ from typing import Any
 
 _SENTINEL = object()
 
-def _v1():
+def _v1() -> Any:
     """Lazy import of v1 module to avoid warnings."""
     from . import v1  # lazy proxy; só avisa/erra se realmente usar v1
     return v1
diff --git a/fastapi/_compat/lazy_import.py b/fastapi/_compat/lazy_import.py
index abdadb399..270017799 100644
--- a/fastapi/_compat/lazy_import.py
+++ b/fastapi/_compat/lazy_import.py
@@ -1,4 +1,4 @@
-# mypy: ignore-errors
+# mypy: disable-error-code=no-untyped-def,no-untyped-call,arg-type,call-arg,attr-defined,valid-type
 # path: fastapi/_compat/import.py
 """
 Centralized lazy import helpers for v1 compatibility.
diff --git a/fastapi/_compat/main.py b/fastapi/_compat/main.py
index 0c46ccada..f0ffec0bb 100644
--- a/fastapi/_compat/main.py
+++ b/fastapi/_compat/main.py
@@ -1,4 +1,4 @@
-# mypy: ignore-errors
+# mypy: disable-error-code=no-untyped-def,no-untyped-call,arg-type,call-arg,attr-defined,valid-type
 from functools import lru_cache
 from typing import (
     Any,
diff --git a/fastapi/_compat/v1.py b/fastapi/_compat/v1.py
index d630a898b..abdc9a553 100644
--- a/fastapi/_compat/v1.py
+++ b/fastapi/_compat/v1.py
@@ -1,4 +1,4 @@
-# mypy: ignore-errors
+# mypy: disable-error-code=no-untyped-def,no-untyped-call,arg-type,call-arg,attr-defined,valid-type
 # path: fastapi/_compat/v1.py
 
 """
@@ -27,7 +27,7 @@ RequiredParam = Ellipsis
 _pv1 = None
 _warned = False
 
-def _load():
+def _load() -> Any:
     global _pv1, _warned
     if _pv1 is not None:
         return _pv1
diff --git a/fastapi/_compat/v2.py b/fastapi/_compat/v2.py
index e83e0731a..946c4a3e0 100644
--- a/fastapi/_compat/v2.py
+++ b/fastapi/_compat/v2.py
@@ -36,7 +36,7 @@ from pydantic_core import Url as Url
 from typing_extensions import Annotated, Literal, get_args, get_origin
 
 # Lazy import of v1 to avoid warnings
-def _get_v1():
+def _get_v1() -> Any:
     """Lazy import of v1 module to avoid warnings."""
     from fastapi._compat import v1
     return v1
diff --git a/fastapi/utils.py b/fastapi/utils.py
index 6a883afd3..1212b60c2 100644
--- a/fastapi/utils.py
+++ b/fastapi/utils.py
@@ -1,4 +1,4 @@
-# mypy: ignore-errors
+# mypy: disable-error-code=no-untyped-def,no-untyped-call,arg-type,call-arg,attr-defined,valid-type
 import re
 import warnings
 from dataclasses import is_dataclass
@@ -37,7 +37,7 @@ if TYPE_CHECKING:  # pragma: nocover
     from .routing import APIRoute
 
 # Lazy import of v1 to avoid warnings
-def _get_v1():
+def _get_v1() -> Any:
     """Lazy import of v1 module to avoid warnings."""
     from fastapi._compat import v1
     return v1