diff --git a/include/osmocom/ctrl/ports.h b/include/osmocom/ctrl/ports.h
index 32a8910a7..71c8e2d33 100644
--- a/include/osmocom/ctrl/ports.h
+++ b/include/osmocom/ctrl/ports.h
@@ -6,3 +6,4 @@
 #define OSMO_CTRL_PORT_NITB_BSC	4249
 #define OSMO_CTRL_PORT_BSC_NAT	4250
 #define OSMO_CTRL_PORT_SGSN	4251
+#define OSMO_CTRL_PORT_CSCN	4255
diff --git a/include/osmocom/vty/ports.h b/include/osmocom/vty/ports.h
index 5375ecf50..71afafd14 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 */