diff --git a/src/gui/UBMainWindow.cpp b/src/gui/UBMainWindow.cpp
index 680ed93d..93292c26 100644
--- a/src/gui/UBMainWindow.cpp
+++ b/src/gui/UBMainWindow.cpp
@@ -202,14 +202,6 @@ bool UBMainWindow::yesNoQuestion(QString windowTitle, QString text)
 #ifdef Q_WS_X11
     // to avoid to be handled by x11. This allows us to keep to the back all the windows manager stuff like palette, toolbar ...
     messageBox.setWindowFlags(Qt::Dialog | Qt::X11BypassWindowManagerHint);
-
-    //To calculate the correct size
-    messageBox.show();
-    QSize messageBoxSize=messageBox.size();
-
-    //to center on the screen because it's no more handled by X11
-    QRect controlScreenRect = UBApplication::applicationController->displayManager()->controlGeometry();
-    messageBox.move((controlScreenRect.width()/2) - (messageBoxSize.width()*0.5), (controlScreenRect.height()/2) - (messageBoxSize.height()*0.5));
 #else
     messageBox.setWindowFlags(Qt::Dialog);
 #endif