diff --git a/mypy/subtypes.py b/mypy/subtypes.py
index d9c1b47c317fe..17b818c49c677 100644
--- a/mypy/subtypes.py
+++ b/mypy/subtypes.py
@@ -1581,7 +1581,6 @@ def get_member_flags(name: str, itype: Instance, class_obj: bool = False) -> set
     """
     info = itype.type
     method = info.get_method(name)
-    setattr_meth = info.get_method("__setattr__")
     if method:
         if isinstance(method, Decorator):
             if method.var.is_staticmethod or method.var.is_classmethod:
@@ -1592,7 +1591,7 @@ def get_member_flags(name: str, itype: Instance, class_obj: bool = False) -> set
             assert isinstance(method, OverloadedFuncDef)
             dec = method.items[0]
             assert isinstance(dec, Decorator)
-            if dec.var.is_settable_property or setattr_meth:
+            if dec.var.is_settable_property or info.get_method("__setattr__"):
                 flags = {IS_VAR, IS_SETTABLE}
                 if dec.var.setter_type is not None:
                     flags.add(IS_EXPLICIT_SETTER)
@@ -1602,7 +1601,7 @@ def get_member_flags(name: str, itype: Instance, class_obj: bool = False) -> set
         return set()  # Just a regular method
     node = info.get(name)
     if not node:
-        if setattr_meth:
+        if info.get_method("__setattr__"):
             return {IS_SETTABLE}
         if itype.extra_attrs and name in itype.extra_attrs.attrs:
             flags = set()