diff --git a/fastapi/_compat/v2.py b/fastapi/_compat/v2.py
index d2d2f3dbb2..535af07849 100644
--- a/fastapi/_compat/v2.py
+++ b/fastapi/_compat/v2.py
@@ -148,7 +148,7 @@ class ModelField:
                 Field(**field_dict["attributes"]),
             )
             self._type_adapter: TypeAdapter[Any] = TypeAdapter(
-                Annotated[annotated_args],
+                Annotated[annotated_args],  # ty: ignore[invalid-type-form]
                 config=self.config,
             )