diff --git a/rwx/src/test/java/org/commonjava/rwx/vocab/NilTest.java b/rwx/src/test/java/org/commonjava/rwx/vocab/NilTest.java
index c4d3de7..f9db6cd 100644
--- a/rwx/src/test/java/org/commonjava/rwx/vocab/NilTest.java
+++ b/rwx/src/test/java/org/commonjava/rwx/vocab/NilTest.java
@@ -37,7 +37,7 @@ public void serializationTest() throws IOException, ClassNotFoundException
         {
             out.writeObject( Nil.NIL_VALUE );
 
-            out.close();
+            out.flush();
 
             try ( ByteArrayInputStream bin = new ByteArrayInputStream( bout.toByteArray() ); ObjectInputStream in = new ObjectInputStream( bin ) )
             {