diff --git a/src/_imaging.c b/src/_imaging.c
index 1e21a5925..4affef92e 100644
--- a/src/_imaging.c
+++ b/src/_imaging.c
@@ -3394,7 +3394,7 @@ _getattr_unsafe_ptrs(ImagingObject* self, void* closure)
 static PyObject*
 _getattr_readonly(ImagingObject* self, void* closure)
 {
-    return PyInt_FromLong(self->image->readonly);
+    return PyLong_FromLong(self->image->readonly);
 }
 
 static struct PyGetSetDef getsetters[] = {