diff --git a/tests/70-xer-test-OK.asn1 b/tests/70-xer-test-OK.asn1
index 7b0770c..19c8b6f 100644
--- a/tests/70-xer-test-OK.asn1
+++ b/tests/70-xer-test-OK.asn1
@@ -21,7 +21,8 @@
 
 	Sequence ::= SEQUENCE {
 		integer		INTEGER,
-		sequence	Sequence OPTIONAL,	-- backreference
+		sequence	Sequence   OPTIONAL,	-- backreference
+		bits		BIT STRING OPTIONAL,
 		string		UTF8String
 	}