diff --git a/Modules/_io/iobase.c b/Modules/_io/iobase.c
index a8e55c34799..195862df5dc 100644
--- a/Modules/_io/iobase.c
+++ b/Modules/_io/iobase.c
@@ -349,8 +349,9 @@ iobase_dealloc(iobase *self)
     if (_PyIOBase_finalize((PyObject *) self) < 0) {
         /* When called from a heap type's dealloc, the type will be
            decref'ed on return (see e.g. subtype_dealloc in typeobject.c). */
-        if (PyType_HasFeature(Py_TYPE(self), Py_TPFLAGS_HEAPTYPE))
+        if (_PyType_HasFeature(Py_TYPE(self), Py_TPFLAGS_HEAPTYPE)) {
             Py_INCREF(Py_TYPE(self));
+        }
         return;
     }
     _PyObject_GC_UNTRACK(self);
diff --git a/Objects/structseq.c b/Objects/structseq.c
index bd20ce3fbdc..8ae8f28cbc5 100644
--- a/Objects/structseq.c
+++ b/Objects/structseq.c
@@ -94,7 +94,7 @@ structseq_dealloc(PyStructSequence *obj)
         Py_XDECREF(obj->ob_item[i]);
     }
     PyObject_GC_Del(obj);
-    if (PyType_GetFlags(tp) & Py_TPFLAGS_HEAPTYPE) {
+    if (_PyType_HasFeature(tp, Py_TPFLAGS_HEAPTYPE)) {
         Py_DECREF(tp);
     }
 }