diff --git a/Ooui/Session.cs b/Ooui/Session.cs
index 3c7eb2f..5f40aed 100644
--- a/Ooui/Session.cs
+++ b/Ooui/Session.cs
@@ -91,9 +91,9 @@ namespace Ooui
 
         protected virtual void QueueMessage (Message message)
         {
-            lock (queuedMessages) {
+            LockQueue();
                 QueueMessageLocked (message);
-            }
+            UnlockQueue();
         }
 
         protected void Error (string message, Exception ex)