diff --git a/tools/python/xen/lowlevel/xc/xc.c b/tools/python/xen/lowlevel/xc/xc.c
index c8ffbe44a7..5d21c38879 100644
--- a/tools/python/xen/lowlevel/xc/xc.c
+++ b/tools/python/xen/lowlevel/xc/xc.c
@@ -2670,7 +2670,7 @@ static void PyXc_dealloc(XcObject *self)
         self->xc_handle = NULL;
     }
 
-    self->ob_type->tp_free((PyObject *)self);
+    Py_TYPE(self)->tp_free((PyObject *)self);
 }
 
 static PyTypeObject PyXcType = {
diff --git a/tools/python/xen/lowlevel/xs/xs.c b/tools/python/xen/lowlevel/xs/xs.c
index e9eef7380c..74a80cade7 100644
--- a/tools/python/xen/lowlevel/xs/xs.c
+++ b/tools/python/xen/lowlevel/xs/xs.c
@@ -922,7 +922,7 @@ static void xshandle_dealloc(XsHandle *self)
 
     Py_XDECREF(self->watches);
 
-    self->ob_type->tp_free((PyObject *)self);
+    Py_TYPE(self)->tp_free((PyObject *)self);
 }
 
 static PyTypeObject xshandle_type = {