diff --git a/smack-extensions/src/main/java/org/jivesoftware/smackx/pubsub/packet/PubSubNamespace.java b/smack-extensions/src/main/java/org/jivesoftware/smackx/pubsub/packet/PubSubNamespace.java
index d1efff2e5..b8a16db83 100644
--- a/smack-extensions/src/main/java/org/jivesoftware/smackx/pubsub/packet/PubSubNamespace.java
+++ b/smack-extensions/src/main/java/org/jivesoftware/smackx/pubsub/packet/PubSubNamespace.java
@@ -31,21 +31,23 @@ public enum PubSubNamespace
 	EVENT("event"),
 	OWNER("owner");
 
-	private String fragment;
+    private final String fragment;
+    private final String fullNamespace;
 
 	private PubSubNamespace(String fragment)
 	{
 		this.fragment = fragment;
+        if (fragment != null) {
+            fullNamespace = PubSub.NAMESPACE + '#' + fragment;
+        }
+        else {
+            fullNamespace = PubSub.NAMESPACE;
+        }
 	}
 
 	public String getXmlns()
 	{
-		String ns = PubSub.NAMESPACE;
-
-		if (fragment != null)
-			ns += '#' + fragment;
-
-		return ns;
+        return fullNamespace;
 	}
 
 	public String getFragment()