diff --git a/Objects/floatobject.c b/Objects/floatobject.c
index 17a55dd..997d1f9 100644
--- a/Objects/floatobject.c
+++ b/Objects/floatobject.c
@@ -1439,7 +1439,7 @@
         goto parse_error;
     result = PyFloat_FromDouble(negate ? -x : x);
     if (cls != (PyObject *)&PyFloat_Type && result != NULL) {
-        Py_SETREF(result, PyObject_CallFunctionObjArgs(cls, result, NULL));
+        Py_SETREF(result, _PyObject_CallArg1(cls, result));
     }
     return result;