diff --git a/apps/openmw/mwgui/class.cpp b/apps/openmw/mwgui/class.cpp
index 88e553821..0ec07c650 100644
--- a/apps/openmw/mwgui/class.cpp
+++ b/apps/openmw/mwgui/class.cpp
@@ -291,8 +291,7 @@ void InfoBoxDialog::layoutVertically(MyGUI::WidgetPtr widget, int margin)
 }
 
 InfoBoxDialog::InfoBoxDialog(MWWorld::Environment& environment)
-    : Layout("openmw_infobox_layout.xml")
-    , environment(environment)
+    : WindowBase("openmw_infobox_layout.xml", environment)
     , currentButton(-1)
 {
     getWidget(textBox, "TextBox");
@@ -373,16 +372,6 @@ void InfoBoxDialog::onButtonClicked(MyGUI::WidgetPtr _sender)
     }
 }
 
-void InfoBoxDialog::center()
-{
-    // Centre dialog
-    MyGUI::IntSize gameWindowSize = environment.mWindowManager->getGui()->getViewSize();
-    MyGUI::IntCoord coord = mMainWidget->getCoord();
-    coord.left = (gameWindowSize.width - coord.width)/2;
-    coord.top = (gameWindowSize.height - coord.height)/2;
-    mMainWidget->setCoord(coord);
-}
-
 /* ClassChoiceDialog */
 
 ClassChoiceDialog::ClassChoiceDialog(MWWorld::Environment& environment)
diff --git a/apps/openmw/mwgui/class.hpp b/apps/openmw/mwgui/class.hpp
index bd7a785a4..816152e3a 100644
--- a/apps/openmw/mwgui/class.hpp
+++ b/apps/openmw/mwgui/class.hpp
@@ -8,6 +8,7 @@
 #include <MyGUI.h>
 
 #include "widgets.hpp"
+#include "window_base.hpp"
 
 namespace MWWorld
 {
@@ -23,7 +24,7 @@ namespace MWGui
 {
     using namespace MyGUI;
 
-    class InfoBoxDialog : public OEngine::GUI::Layout
+    class InfoBoxDialog : public WindowBase
     {
     public:
         InfoBoxDialog(MWWorld::Environment& environment);
@@ -49,9 +50,6 @@ namespace MWGui
         void onButtonClicked(MyGUI::WidgetPtr _sender);
 
     private:
-        void center();
-
-        MWWorld::Environment& environment;
 
         void fitToText(MyGUI::StaticTextPtr widget);
         void layoutVertically(MyGUI::WidgetPtr widget, int margin);