diff --git a/utils/misc/src/main/java/org/onlab/util/KryoNamespace.java b/utils/misc/src/main/java/org/onlab/util/KryoNamespace.java
index 42d801b..1bfe3bc 100644
--- a/utils/misc/src/main/java/org/onlab/util/KryoNamespace.java
+++ b/utils/misc/src/main/java/org/onlab/util/KryoNamespace.java
@@ -171,6 +171,7 @@
         Kryo kryo = getKryo();
         try {
             kryo.writeClassAndObject(out, obj);
+            out.flush();
             return out.toBytes();
         } finally {
             putKryo(kryo);
@@ -188,6 +189,7 @@
         Kryo kryo = getKryo();
         try {
             kryo.writeClassAndObject(out, obj);
+            out.flush();
         } finally {
             putKryo(kryo);
         }