diff --git a/build/resources/META-INF/smack-config.xml b/build/resources/META-INF/smack-config.xml
index 09068ad76..42874aa98 100644
--- a/build/resources/META-INF/smack-config.xml
+++ b/build/resources/META-INF/smack-config.xml
@@ -9,6 +9,7 @@
         <className>org.jivesoftware.smackx.XHTMLManager</className>
         <className>org.jivesoftware.smackx.muc.MultiUserChat</className>
         <className>org.jivesoftware.smackx.filetransfer.FileTransferManager</className>
+        <className>org.jivesoftware.smackx.LastActivityManager</className>
     </startupClasses>
 
     <!-- Paket reply timeout in milliseconds -->