diff --git a/core/api/src/main/java/org/onosproject/net/pi/runtime/PiPreReplica.java b/core/api/src/main/java/org/onosproject/net/pi/runtime/PiPreReplica.java
index b661d27..4f65e4d 100644
--- a/core/api/src/main/java/org/onosproject/net/pi/runtime/PiPreReplica.java
+++ b/core/api/src/main/java/org/onosproject/net/pi/runtime/PiPreReplica.java
@@ -84,6 +84,6 @@
 
     @Override
     public String toString() {
-        return format("%s:%d", egressPort, instanceId);
+        return format("%s:0x%s", egressPort, Integer.toHexString(instanceId));
     }
 }