diff --git a/library/GSM_RR_Types.ttcn b/library/GSM_RR_Types.ttcn
index 66e49fa..a0d8349 100644
--- a/library/GSM_RR_Types.ttcn
+++ b/library/GSM_RR_Types.ttcn
@@ -277,7 +277,10 @@
 	type record MobileAllocation {
 		uint8_t 	len,
 		bitstring	ma
-	} with { variant (len) "LENGTHTO(ma)" };
+	} with {
+		variant (len) "LENGTHTO(ma)"
+		variant (ma) "BYTEORDER(last), BITORDER(msb)"
+	};
 
 	/* 10.5.2.25a */
 	type record PktChDesc0Ind {