diff --git a/mypy_django_plugin/transformers/managers.py b/mypy_django_plugin/transformers/managers.py
index 78d23b145..3499521fd 100644
--- a/mypy_django_plugin/transformers/managers.py
+++ b/mypy_django_plugin/transformers/managers.py
@@ -146,7 +146,7 @@ def _process_dynamic_method(
         ):
             ret_type = _replace_type_var(ret_type, base_that_has_method.defn.type_vars[0].fullname, typed_var[0])
             args_types = [
-                _replace_type_var(arg_type, base_that_has_method.defn.type_vars[0].fullname, manager_instance.args[0])
+                _replace_type_var(arg_type, base_that_has_method.defn.type_vars[0].fullname, typed_var[0])
                 for arg_type in args_types
             ]
     if base_that_has_method.self_type: