diff --git a/library/RLCMAC_CSN1_Templates.ttcn b/library/RLCMAC_CSN1_Templates.ttcn
index 727d4b8..64c709a 100644
--- a/library/RLCMAC_CSN1_Templates.ttcn
+++ b/library/RLCMAC_CSN1_Templates.ttcn
@@ -213,4 +213,10 @@
 		pwr_ctrl := *
 	};
 
+	template EgprsAckNackDescriptionIE ts_EgprsAckNackDescriptionIE(template EgprsAckNackDescription andesc) := {
+		len_present := '1'B,
+		len := 0, /* Overwritten by RAW encoder */
+		acknack_desc := andesc
+	}
+
 } with { encode "RAW"; variant "FIELDORDER(msb)" variant "BYTEORDER(last)" };