diff --git a/library/Osmocom_Gb_Types.ttcn b/library/Osmocom_Gb_Types.ttcn
index 687a073..76988b5 100644
--- a/library/Osmocom_Gb_Types.ttcn
+++ b/library/Osmocom_Gb_Types.ttcn
@@ -1815,7 +1815,7 @@
 		}
 	}
 	template (present) PDU_BSSGP tr_BSSGP_DL_UD(template (present) GprsTlli tlli, template (present) octetstring pdu,
-					  template (omit) IMSI_BSSGP imsi := omit) := {
+					  template IMSI_BSSGP imsi := omit) := {
 		pDU_BSSGP_DL_UNITDATA := {
 			bssgpPduType := '00'O,
 			tLLI_current := tlli,