diff --git a/core/net/src/test/java/org/onosproject/net/device/impl/DeviceManagerTest.java b/core/net/src/test/java/org/onosproject/net/device/impl/DeviceManagerTest.java
index 04f266f..7017481 100644
--- a/core/net/src/test/java/org/onosproject/net/device/impl/DeviceManagerTest.java
+++ b/core/net/src/test/java/org/onosproject/net/device/impl/DeviceManagerTest.java
@@ -274,6 +274,11 @@
         public boolean isReachable(DeviceId device) {
             return false;
         }
+
+        @Override
+        public void changePortState(DeviceId deviceId, PortNumber portNumber,
+                                    boolean enable) {
+        }
     }
 
     private static class TestListener implements DeviceListener {