diff --git a/src/controls/QskWindow.cpp b/src/controls/QskWindow.cpp
index c05a39b3..92b20f23 100644
--- a/src/controls/QskWindow.cpp
+++ b/src/controls/QskWindow.cpp
@@ -220,6 +220,18 @@ QskWindow::~QskWindow()
 #endif
 }
 
+#if QT_VERSION < QT_VERSION_CHECK( 5, 9, 0 )
+
+void QskWindow::setFlag(Qt::WindowType flag, bool on)
+{
+    if( on )
+        setFlags( flags() | flag );
+    else
+        setFlags( flags() & ~flag );
+}
+
+#endif
+
 void QskWindow::setScreen( const QString& name )
 {
     if ( !name.isEmpty() )
diff --git a/src/controls/QskWindow.h b/src/controls/QskWindow.h
index 8a2a158f..de5ef4a5 100644
--- a/src/controls/QskWindow.h
+++ b/src/controls/QskWindow.h
@@ -43,6 +43,10 @@ class QSK_EXPORT QskWindow : public QQuickWindow
     using Inherited::setScreen;
     void setScreen( const QString& );
 
+#if QT_VERSION < QT_VERSION_CHECK( 5, 9, 0 )
+    void setFlag( Qt::WindowType, bool on = true );
+#endif
+
     bool deleteOnClose() const;
     void setDeleteOnClose( bool );