diff --git a/src/corelib/kernel/qabstracteventdispatcher.h b/src/corelib/kernel/qabstracteventdispatcher.h
index a256b03523a..0d3e53e4a7c 100644
--- a/src/corelib/kernel/qabstracteventdispatcher.h
+++ b/src/corelib/kernel/qabstracteventdispatcher.h
@@ -102,9 +102,7 @@ public:
 
     virtual void wakeUp() = 0;
     virtual void interrupt() = 0;
-#if QT_DEPRECATED_SINCE(5, 9)
-    QT_DEPRECATED virtual void flush() = 0;
-#endif
+    virtual void flush() = 0; // ### Qt6: remove, mark final or make protected
 
     virtual void startingUp();
     virtual void closingDown();