diff --git a/library/GSM_RR_Types.ttcn b/library/GSM_RR_Types.ttcn
index a0d8349..c12ebd1 100644
--- a/library/GSM_RR_Types.ttcn
+++ b/library/GSM_RR_Types.ttcn
@@ -279,7 +279,7 @@
 		bitstring	ma
 	} with {
 		variant (len) "LENGTHTO(ma)"
-		variant (ma) "BYTEORDER(last), BITORDER(msb)"
+		variant (ma) "BYTEORDER(first), BITORDER(msb)"
 	};
 
 	/* 10.5.2.25a */