diff --git a/Objects/fileobject.c b/Objects/fileobject.c
index 0faf7e7..61c9428 100644
--- a/Objects/fileobject.c
+++ b/Objects/fileobject.c
@@ -185,8 +185,10 @@
     if (PyLong_Check(o)) {
         fd = _PyLong_AsInt(o);
     }
-    else if ((meth = _PyObject_GetAttrId(o, &PyId_fileno)) != NULL)
-    {
+    else if (_PyObject_LookupAttrId(o, &PyId_fileno, &meth) < 0) {
+        return -1;
+    }
+    else if (meth != NULL) {
         PyObject *fno = _PyObject_CallNoArg(meth);
         Py_DECREF(meth);
         if (fno == NULL)