diff --git a/apps/roadm/app/src/main/java/org/onosproject/roadm/RoadmManager.java b/apps/roadm/app/src/main/java/org/onosproject/roadm/RoadmManager.java
index a98b252..e04bad9 100644
--- a/apps/roadm/app/src/main/java/org/onosproject/roadm/RoadmManager.java
+++ b/apps/roadm/app/src/main/java/org/onosproject/roadm/RoadmManager.java
@@ -311,6 +311,7 @@
                 .add(Criteria.matchLambda(ochSignal))
                 .build();
         TrafficTreatment treatment = DefaultTrafficTreatment.builder()
+                .add(Instructions.modL0Lambda(ochSignal))
                 .add(Instructions.createOutput(outPort))
                 .build();