added CHOICE tag

diff --git a/tests/59-choice-extended-OK.asn1 b/tests/59-choice-extended-OK.asn1
index 06b3bc7..0e49221 100644
--- a/tests/59-choice-extended-OK.asn1
+++ b/tests/59-choice-extended-OK.asn1
@@ -11,7 +11,7 @@
 	DEFINITIONS AUTOMATIC TAGS ::=
 BEGIN
 
-	Choice ::= CHOICE {
+	Choice ::= [123] CHOICE {
 		a	INTEGER,
 		...,
 		b	INTEGER,