diff --git a/core/store/dist/src/main/java/org/onosproject/store/cluster/impl/HazelcastClusterStore.java b/core/store/dist/src/main/java/org/onosproject/store/cluster/impl/HazelcastClusterStore.java
index 55d877d..827fec2 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/cluster/impl/HazelcastClusterStore.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/cluster/impl/HazelcastClusterStore.java
@@ -24,12 +24,12 @@
 import com.hazelcast.core.MemberAttributeEvent;
 import com.hazelcast.core.MembershipEvent;
 import com.hazelcast.core.MembershipListener;
-
 import org.apache.felix.scr.annotations.Activate;
 import org.apache.felix.scr.annotations.Component;
 import org.apache.felix.scr.annotations.Deactivate;
 import org.apache.felix.scr.annotations.Service;
 import org.joda.time.DateTime;
+import org.onlab.packet.IpAddress;
 import org.onosproject.cluster.ClusterEvent;
 import org.onosproject.cluster.ClusterStore;
 import org.onosproject.cluster.ClusterStoreDelegate;
@@ -39,7 +39,6 @@
 import org.onosproject.store.hz.AbsentInvalidatingLoadingCache;
 import org.onosproject.store.hz.AbstractHazelcastStore;
 import org.onosproject.store.hz.OptionalCacheLoader;
-import org.onlab.packet.IpAddress;
 
 import java.util.Map;
 import java.util.Set;
@@ -131,6 +130,11 @@
     }
 
     @Override
+    public void formCluster(Set<ControllerNode> nodes, String ipPrefix) {
+        throw new UnsupportedOperationException("formCluster not implemented");
+    }
+
+    @Override
     public ControllerNode addNode(NodeId nodeId, IpAddress ip, int tcpPort) {
         return addNode(new DefaultControllerNode(nodeId, ip, tcpPort));
     }