diff --git a/packages/autorest.python/autorest/codegen/serializers/builder_serializer.py b/packages/autorest.python/autorest/codegen/serializers/builder_serializer.py
index 28cdf29d54b..99f415401ba 100644
--- a/packages/autorest.python/autorest/codegen/serializers/builder_serializer.py
+++ b/packages/autorest.python/autorest/codegen/serializers/builder_serializer.py
@@ -1310,22 +1310,22 @@ def error_map(self, builder: OperationType) -> List[str]:
                     if status_code == 401:
                         retval.append(
                             "    401: lambda response: ClientAuthenticationError(response=response"
-                            f"{error_model_str}{error_format_str}),"
+                            f"{error_model_str}{error_format_str}), # type: ignore"
                         )
                     elif status_code == 404:
                         retval.append(
                             "    404: lambda response: ResourceNotFoundError(response=response"
-                            f"{error_model_str}{error_format_str}),"
+                            f"{error_model_str}{error_format_str}), # type: ignore"
                         )
                     elif status_code == 409:
                         retval.append(
                             "    409: lambda response: ResourceExistsError(response=response"
-                            f"{error_model_str}{error_format_str}),"
+                            f"{error_model_str}{error_format_str}), # type: ignore"
                         )
                     elif status_code == 304:
                         retval.append(
                             "    304: lambda response: ResourceNotModifiedError(response=response"
-                            f"{error_model_str}{error_format_str}),"
+                            f"{error_model_str}{error_format_str}), # type: ignore"
                         )
                     elif not error_model_str and not error_format_str:
                         retval.append(f"    {status_code}: HttpResponseError,")
@@ -1333,7 +1333,7 @@ def error_map(self, builder: OperationType) -> List[str]:
                         retval.append(
                             f"    {status_code}: cast(Type[HttpResponseError], "
                             "lambda response: HttpResponseError(response=response"
-                            f"{error_model_str}{error_format_str})),"
+                            f"{error_model_str}{error_format_str})), # type: ignore"
                         )
         else:
             retval.append(
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/XmsErrorResponseVersionTolerant/xmserrorresponseversiontolerant/aio/operations/_operations.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/XmsErrorResponseVersionTolerant/xmserrorresponseversiontolerant/aio/operations/_operations.py
index fe7e0ed1daf..4fb52dd1287 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/XmsErrorResponseVersionTolerant/xmserrorresponseversiontolerant/aio/operations/_operations.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/XmsErrorResponseVersionTolerant/xmserrorresponseversiontolerant/aio/operations/_operations.py
@@ -77,7 +77,7 @@ async def get_pet_by_id(self, pet_id: str, **kwargs: Any) -> Optional[JSON]:
             409: ResourceExistsError,
             304: ResourceNotModifiedError,
             400: HttpResponseError,
-            404: lambda response: ResourceNotFoundError(response=response),
+            404: lambda response: ResourceNotFoundError(response=response),  # type: ignore
             501: HttpResponseError,
         }
         error_map.update(kwargs.pop("error_map", {}) or {})
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/XmsErrorResponseVersionTolerant/xmserrorresponseversiontolerant/operations/_operations.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/XmsErrorResponseVersionTolerant/xmserrorresponseversiontolerant/operations/_operations.py
index cf02be29bf7..725a02498a2 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/XmsErrorResponseVersionTolerant/xmserrorresponseversiontolerant/operations/_operations.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/XmsErrorResponseVersionTolerant/xmserrorresponseversiontolerant/operations/_operations.py
@@ -134,7 +134,7 @@ def get_pet_by_id(self, pet_id: str, **kwargs: Any) -> Optional[JSON]:
             409: ResourceExistsError,
             304: ResourceNotModifiedError,
             400: HttpResponseError,
-            404: lambda response: ResourceNotFoundError(response=response),
+            404: lambda response: ResourceNotFoundError(response=response),  # type: ignore
             501: HttpResponseError,
         }
         error_map.update(kwargs.pop("error_map", {}) or {})