new debugger symbol names
diff --git a/Objects/stringobject.c b/Objects/stringobject.c
index ac03ff6..1e11c50 100644
--- a/Objects/stringobject.c
+++ b/Objects/stringobject.c
@@ -507,7 +507,7 @@
 		return -1;
 	}
 	/* XXX UNREF/NEWREF interface should be more symmetrical */
-#ifdef REF_DEBUG
+#ifdef Py_REF_DEBUG
 	--_Py_RefTotal;
 #endif
 	UNREF(v);