diff --git a/acconfig.h b/acconfig.h
index 685b41c..98d4195 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -22,6 +22,11 @@
 /*
  * Define if you want to include upstream proxy support
  */
+#undef UPSTREAM_SUPPORT
+
+/*
+ * Define if you want to include TCP tunnelling
+ */
 #undef TUNNEL_SUPPORT
 
 /*