diff --git a/smack-extensions/src/main/java/org/jivesoftware/smackx/iqprivate/PrivateDataManager.java b/smack-extensions/src/main/java/org/jivesoftware/smackx/iqprivate/PrivateDataManager.java
index 70141eef2..789e187cd 100644
--- a/smack-extensions/src/main/java/org/jivesoftware/smackx/iqprivate/PrivateDataManager.java
+++ b/smack-extensions/src/main/java/org/jivesoftware/smackx/iqprivate/PrivateDataManager.java
@@ -285,7 +285,7 @@ public class PrivateDataManager extends Manager {
             StringBuilder buf = new StringBuilder();
             buf.append("<query xmlns=\"jabber:iq:private\">");
             if (privateData != null) {
-                privateData.toXML();
+                buf.append(privateData.toXML());
             }
             buf.append("</query>");
             return buf.toString();