diff --git a/src/engine_gui.cpp b/src/engine_gui.cpp
--- a/src/engine_gui.cpp
+++ b/src/engine_gui.cpp
@@ -97,12 +97,12 @@ struct EnginePreviewWindow : Window {
 	}
 };
 
-static const WindowDesc _engine_preview_desc = {
+static const WindowDesc _engine_preview_desc(
 	WDP_CENTER, WDP_CENTER, 300, 192, 300, 192,
 	WC_ENGINE_PREVIEW, WC_NONE,
 	WDF_STD_TOOLTIPS | WDF_STD_BTN | WDF_DEF_WIDGET | WDF_CONSTRUCTION,
-	_engine_preview_widgets,
-};
+	_engine_preview_widgets
+);
 
 
 void ShowEnginePreviewWindow(EngineID engine)