diff --git a/regression_test/octetstrOper/ToctetstrOper.ttcn b/regression_test/octetstrOper/ToctetstrOper.ttcn
index 9367386edff3cf18920e8cbb35ec54c842d2f59c..7f796a5b74cd4f3ee72cf1b4d69fbcd2c00bc8c4 100644
--- a/regression_test/octetstrOper/ToctetstrOper.ttcn
+++ b/regression_test/octetstrOper/ToctetstrOper.ttcn
@@ -586,7 +586,7 @@ testcase tc_altstep_os_idx() runs on CT {
 	var octetstring vl_str := '0001'O
 	connect(self:OS, self:OS);
 	T.start(1.0);
-	OS.send(vl_str[0]); //<====== This is compiled for an erroneous code
+	OS.send(vl_str[0]);
 	as_os(vl_str[0]);
 	T.stop;
 }