diff --git a/Objects/object.c b/Objects/object.c
index 9c4cd6a..c1bdc71 100644
--- a/Objects/object.c
+++ b/Objects/object.c
@@ -1001,7 +1001,7 @@
 
 
 /* Hack to force loading of abstract.o */
-int (*_Py_abstract_hack) Py_FPROTO((PyObject *)) = &PyObject_Length;
+int (*_Py_abstract_hack)(PyObject *) = &PyObject_Length;
 
 
 /* Python's malloc wrappers (see mymalloc.h) */