diff --git a/library/MNCC_Types.ttcn b/library/MNCC_Types.ttcn
index f1d9e37..1d7980a 100644
--- a/library/MNCC_Types.ttcn
+++ b/library/MNCC_Types.ttcn
@@ -169,7 +169,7 @@
 	coding		:= 0,	/* GSM standard */
 	radio		:= 3,	/* FR/HR, FR preferred */
 	speech_ctm	:= 0,	/* not supported */
-	speech_ver	:= { 0, 2, 4, 1, 5 },
+	speech_ver	:= { 0, 2, 4, 1, 5, -1 },
 	data		:= omit
 };