diff --git a/src/pluto/constants.h b/src/pluto/constants.h
index e9567c07a..9c87926d0 100644
--- a/src/pluto/constants.h
+++ b/src/pluto/constants.h
@@ -559,10 +559,6 @@ extern enum_names modecfg_attr_names;
 
 extern enum_names xauth_attr_names;
 
-/* ISAKMP mode config attributes specific to Microsoft */
-#define INTERNAL_IP4_SERVER         23456
-#define INTERNAL_IP6_SERVER         23457
-
 extern enum_names microsoft_attr_names;
 
 /* ISAKMP mode config attributes specific to the Unity vendor ID */