diff --git a/Objects/frameobject.c b/Objects/frameobject.c
index 2153cd8..3cb6a0d 100644
--- a/Objects/frameobject.c
+++ b/Objects/frameobject.c
@@ -509,8 +509,7 @@
 
 
 PyTypeObject PyFrame_Type = {
-	PyObject_HEAD_INIT(&PyType_Type)
-	0,
+	PyVarObject_HEAD_INIT(&PyType_Type, 0)
 	"frame",
 	sizeof(PyFrameObject),
 	sizeof(PyObject *),
@@ -623,7 +622,7 @@
 		    --numfree;
 		    f = free_list;
 		    free_list = free_list->f_back;
-		    if (f->ob_size < extras) {
+		    if (Py_Size(f) < extras) {
 			    f = PyObject_GC_Resize(PyFrameObject, f, extras);
 			    if (f == NULL) {
 				    Py_DECREF(builtins);