diff --git a/include/osmocom/vty/ports.h b/include/osmocom/vty/ports.h
index 5375ecf..71afafd 100644
--- a/include/osmocom/vty/ports.h
+++ b/include/osmocom/vty/ports.h
@@ -15,3 +15,4 @@
 #define OSMO_VTY_PORT_BTSMGR	4252
 #define OSMO_VTY_PORT_GTPHUB	4253
 #define OSMO_VTY_PORT_CSCN	4254
+/* 4255 used by control interface */