diff --git a/TS_103_280.asn1 b/TS_103_280.asn1
index 68cfe54e9a3e75ef0565bd50cd1c0d4bdbc8793f..e33cf83dbab5c3f3bbd4524440ee4bd334f88b53 100644
--- a/TS_103_280.asn1
+++ b/TS_103_280.asn1
@@ -91,4 +91,6 @@ GPSINAI ::= NAI
 
 NAI ::= UTF8String
 
+5G-GUTI:: UTF8string
+
 END