diff --git a/src/concurrent/qtconcurrentthreadengine.h b/src/concurrent/qtconcurrentthreadengine.h
index b7be48d6125..a04f69f8e4a 100644
--- a/src/concurrent/qtconcurrentthreadengine.h
+++ b/src/concurrent/qtconcurrentthreadengine.h
@@ -126,7 +126,7 @@ protected:
 
 
 template <typename T>
-class ThreadEngine : public virtual ThreadEngineBase
+class ThreadEngine : public ThreadEngineBase
 {
 public:
     typedef T ResultType;