diff --git a/core/api/src/main/java/org/onosproject/net/flow/DefaultTrafficTreatment.java b/core/api/src/main/java/org/onosproject/net/flow/DefaultTrafficTreatment.java
index 6174cef..ac37d1f 100644
--- a/core/api/src/main/java/org/onosproject/net/flow/DefaultTrafficTreatment.java
+++ b/core/api/src/main/java/org/onosproject/net/flow/DefaultTrafficTreatment.java
@@ -15,9 +15,11 @@
  */
 package org.onosproject.net.flow;
 
-import com.google.common.base.MoreObjects;
-import com.google.common.collect.ImmutableList;
-import com.google.common.collect.Lists;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import java.util.List;
+import java.util.Objects;
+
 import org.onlab.packet.EthType;
 import org.onlab.packet.IpAddress;
 import org.onlab.packet.MacAddress;
@@ -31,10 +33,9 @@
 import org.onosproject.net.flow.instructions.Instructions;
 import org.onosproject.net.meter.MeterId;
 
-import java.util.List;
-import java.util.Objects;
-
-import static com.google.common.base.Preconditions.checkNotNull;
+import com.google.common.base.MoreObjects;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Lists;
 
 /**
  * Default traffic treatment implementation.
@@ -239,6 +240,7 @@
                 case GROUP:
                 case QUEUE:
                 case L0MODIFICATION:
+                case L1MODIFICATION:
                 case L2MODIFICATION:
                 case L3MODIFICATION:
                 case L4MODIFICATION: