diff --git a/src/concurrent/qtconcurrentthreadengine.h b/src/concurrent/qtconcurrentthreadengine.h
index 3ecdc84600..9d8f2ddd58 100644
--- a/src/concurrent/qtconcurrentthreadengine.h
+++ b/src/concurrent/qtconcurrentthreadengine.h
@@ -72,11 +72,7 @@ private:
     // variable. The count can be either positive or negative - a negative
     // count signals that a thread is waiting on the barrier.
 
-    // BC note: inlined code from Qt < 4.6 will expect to find the QMutex 
-    // and QAtomicInt here. ### Qt 5: remove.
-    QMutex mutex;
     QAtomicInt count;
-
     QSemaphore semaphore;
 public:
     ThreadEngineBarrier();