diff --git a/src/gtk/window.cpp b/src/gtk/window.cpp
index f87f5acc1e..48f481aa9a 100644
--- a/src/gtk/window.cpp
+++ b/src/gtk/window.cpp
@@ -4005,7 +4005,7 @@ void wxWindowGTK::ApplyWidgetStyle(bool forceStyle)
 
 void wxWindowGTK::DoApplyWidgetStyle(GtkRcStyle *style)
 {
-    wxSuspendStyleEvents s(this);
+    wxSuspendStyleEvents s((wxWindow *)this);
 
     if (m_wxwindow)
         gtk_widget_modify_style(m_wxwindow, style);