diff --git a/core/api/src/main/java/org/onosproject/net/flow/DefaultTrafficSelector.java b/core/api/src/main/java/org/onosproject/net/flow/DefaultTrafficSelector.java
index d3c2449..0525d8f 100644
--- a/core/api/src/main/java/org/onosproject/net/flow/DefaultTrafficSelector.java
+++ b/core/api/src/main/java/org/onosproject/net/flow/DefaultTrafficSelector.java
@@ -15,14 +15,8 @@
  */
 package org.onosproject.net.flow;
 
-import java.util.Collections;
-import java.util.Comparator;
-import java.util.HashMap;
-import java.util.Map;
-import java.util.Objects;
-import java.util.Set;
-import java.util.TreeSet;
-
+import com.google.common.base.MoreObjects;
+import com.google.common.collect.ImmutableSet;
 import org.onlab.packet.Ip4Address;
 import org.onlab.packet.Ip6Address;
 import org.onlab.packet.IpPrefix;
@@ -30,12 +24,19 @@
 import org.onlab.packet.MplsLabel;
 import org.onlab.packet.TpPort;
 import org.onlab.packet.VlanId;
+import org.onosproject.net.DeviceId;
 import org.onosproject.net.PortNumber;
 import org.onosproject.net.flow.criteria.Criteria;
 import org.onosproject.net.flow.criteria.Criterion;
+import org.onosproject.net.flow.criteria.ExtensionSelector;
 
-import com.google.common.base.MoreObjects;
-import com.google.common.collect.ImmutableSet;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.TreeSet;
 
 /**
  * Default traffic selector implementation.
@@ -379,6 +380,12 @@
         }
 
         @Override
+        public TrafficSelector.Builder extension(ExtensionSelector extensionSelector,
+                                                 DeviceId deviceId) {
+            return add(Criteria.extension(extensionSelector, deviceId));
+        }
+
+        @Override
         public TrafficSelector build() {
             return new DefaultTrafficSelector(ImmutableSet.copyOf(selector.values()));
         }