diff --git a/sysinfo/GSM_Types.ttcn b/sysinfo/GSM_Types.ttcn
index 924788cbd..71c74f73f 100644
--- a/sysinfo/GSM_Types.ttcn
+++ b/sysinfo/GSM_Types.ttcn
@@ -175,19 +175,27 @@ module GSM_Types {
 	} with { variant "" };
 
 	type record MobileIdentityTMSI {
-		MobileIdentityType	mi_type (MI_TYPE_TMSI),
-		boolean			odd (false),
 		BIT4			pad ('1111'B),
+		boolean			odd (false),
+		MobileIdentityType	mi_type (MI_TYPE_TMSI),
 		GsmTmsi			tmsi
 	} with { variant "" };
 
+	type record MobileIdentityNone {
+		BIT4			pad ('1111'B),
+		boolean			odd (false),
+		MobileIdentityType	mi_type (MI_TYPE_NONE)
+	} with { variant "" };
+
 	type union MobileIdentity {
 		MobileIdentityBCD	bcd,
-		MobileIdentityTMSI	tmsi
+		MobileIdentityTMSI	tmsi,
+		MobileIdentityNone	unused
 	} with { variant "TAG(bcd, mi_type = MI_TYPE_IMSI;
 			      bcd, mi_type = MI_TYPE_IMEI;
 			      bcd, mi_type = MI_TYPE_IMEISV;
-			      tmsi, mi_type = MI_TYPE_TMSI)" };
+			      tmsi, mi_type = MI_TYPE_TMSI;
+			      unused, mi_type = MI_TYPE_NONE)" };
 
 	type record MobileIdentityLV {
 		uint8_t		len,