diff --git a/examples/rustapi_module/tests/test_datetime.py b/examples/rustapi_module/tests/test_datetime.py
index eb91c8b8..b34b47d4 100644
--- a/examples/rustapi_module/tests/test_datetime.py
+++ b/examples/rustapi_module/tests/test_datetime.py
@@ -272,10 +272,9 @@ def test_tz_class():
     assert dt.utcoffset() == pdt.timedelta(hours=1)
     assert dt.dst() is None
 
-@pytest.mark.skip(reason='to debug with the latest master')
 def test_tz_class_introspection():
     tzi = rdt.TzClass()
 
     assert tzi.__class__ == rdt.TzClass
-    assert repr(tzi) == "TzClass()"
+    assert repr(tzi).startswith('<rustapi_module.datetime.TzClass object at')
 
diff --git a/src/typeob.rs b/src/typeob.rs
index 9cffc33a..7ecba0bd 100644
--- a/src/typeob.rs
+++ b/src/typeob.rs
@@ -441,11 +441,6 @@ where
 
     // set type flags
     py_class_flags::<T>(type_object);
-    if type_object.tp_base
-        != unsafe { &ffi::PyBaseObject_Type as *const ffi::PyTypeObject as *mut ffi::PyTypeObject }
-    {
-        type_object.tp_flags |= ffi::Py_TPFLAGS_HEAPTYPE
-    }
 
     // register type object
     unsafe {