diff --git a/Modules/_ctypes/_ctypes.c b/Modules/_ctypes/_ctypes.c
index 8bb34877c53..5f8a723f637 100644
--- a/Modules/_ctypes/_ctypes.c
+++ b/Modules/_ctypes/_ctypes.c
@@ -5745,7 +5745,7 @@ _ctypes_add_types(PyObject *mod)
     TYPE_READY(&StructParam_Type);
 
 #ifdef MS_WIN32
-    TYPE_READY_BASE(&PyComError_Type, PyExc_Exception);
+    TYPE_READY_BASE(&PyComError_Type, (PyTypeObject*)PyExc_Exception);
 #endif
 
 #undef TYPE_READY