diff --git a/sysinfo/GSMTAP_Types.ttcn b/sysinfo/GSMTAP_Types.ttcn
index 9e7d980..3288284 100644
--- a/sysinfo/GSMTAP_Types.ttcn
+++ b/sysinfo/GSMTAP_Types.ttcn
@@ -3,6 +3,8 @@
 
 	const uint8_t GSMTAP_VERSION	:= 2;
 
+	const uint16_t GSMTAP_PORT	:= 4729;
+
 	type enumerated GsmtapMsgType {
 		GSMTAP_TYPE_UM (1),
 		GSMTAP_TYPE_ABIS (2),