diff --git a/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/KryoNamespaces.java b/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/KryoNamespaces.java
index 4fc88b6..e5f57a8 100644
--- a/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/KryoNamespaces.java
+++ b/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/KryoNamespaces.java
@@ -115,6 +115,7 @@
                     //
                     ControllerNode.State.class,
                     Device.Type.class,
+                    Port.Type.class,
                     ChassisId.class,
                     DefaultAnnotations.class,
                     DefaultControllerNode.class,