diff --git a/src/libs/vmisc/compatibility.h b/src/libs/vmisc/compatibility.h
index 3c8ca605d..f7fe01ad6 100644
--- a/src/libs/vmisc/compatibility.h
+++ b/src/libs/vmisc/compatibility.h
@@ -493,4 +493,21 @@ inline void RemoveLast(QString &str)
 #endif
 }
 
+//---------------------------------------------------------------------------------------------------------------------
+inline void SetWindowFlag(QWidget *widget, Qt::WindowType flag, bool on = true)
+{
+#if QT_VERSION >= QT_VERSION_CHECK(5, 9, 0)
+    widget->setWindowFlag(flag, on);
+#else
+    if (on)
+    {
+        widget->setWindowFlags(widget->windowFlags() | flag);
+    }
+    else
+    {
+        widget->setWindowFlags(widget->windowFlags() & ~flag);
+    }
+#endif
+}
+
 #endif // COMPATIBILITY_H
diff --git a/src/libs/vwidgets/vabstractmainwindow.cpp b/src/libs/vwidgets/vabstractmainwindow.cpp
index 12fe9f5c0..f628bf6f7 100644
--- a/src/libs/vwidgets/vabstractmainwindow.cpp
+++ b/src/libs/vwidgets/vabstractmainwindow.cpp
@@ -414,7 +414,7 @@ void VAbstractMainWindow::ExportDataToCSV()
 //---------------------------------------------------------------------------------------------------------------------
 void VAbstractMainWindow::AlwaysOnTop(bool state)
 {
-    setWindowFlag(Qt::WindowStaysOnTopHint, state);
+    SetWindowFlag(this, Qt::WindowStaysOnTopHint, state);
     destroy();
     create();
     setVisible(true);