diff --git a/Include/object.h b/Include/object.h
index 7848cf4..dc58995 100644
--- a/Include/object.h
+++ b/Include/object.h
@@ -479,6 +479,10 @@
 } _Py_HashSecret_t;
 PyAPI_DATA(_Py_HashSecret_t) _Py_HashSecret;
 
+#ifdef Py_DEBUG
+PyAPI_DATA(int) _Py_HashSecret_Initialized;
+#endif
+
 /* Helper for passing objects to printf and the like */
 #define PyObject_REPR(obj) _PyUnicode_AsString(PyObject_Repr(obj))