diff --git a/library/IPA_Types.ttcn b/library/IPA_Types.ttcn
index 933a3fe..3230329 100644
--- a/library/IPA_Types.ttcn
+++ b/library/IPA_Types.ttcn
@@ -98,7 +98,7 @@
 type record IpaCcmRespPart {
 	uint16_t	len,
 	IpaCcmIdTag	tag,
-	charstring	data
+	octetstring	data
 } with { variant (len) "LENGTHTO(data,tag)" }
 type set of IpaCcmRespPart IpaCcmIdResp;