diff --git a/smack-extensions/src/main/java/org/jivesoftware/smackx/muc/MultiUserChat.java b/smack-extensions/src/main/java/org/jivesoftware/smackx/muc/MultiUserChat.java
index 7d341c5f9..0d8a09e64 100644
--- a/smack-extensions/src/main/java/org/jivesoftware/smackx/muc/MultiUserChat.java
+++ b/smack-extensions/src/main/java/org/jivesoftware/smackx/muc/MultiUserChat.java
@@ -969,7 +969,7 @@ public class MultiUserChat {
      * @throws InterruptedException 
      * @throws MucNotJoinedException 
      */
-    public void changeNickname(Resourcepart nickname) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException, MucNotJoinedException  {
+    public synchronized void changeNickname(Resourcepart nickname) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException, MucNotJoinedException  {
         StringUtils.requireNotNullOrEmpty(nickname, "Nickname must not be null or blank.");
         // Check that we already have joined the room before attempting to change the
         // nickname.