diff --git a/src/holt_container_window.cc b/src/holt_container_window.cc
index 9590a73..9161a43 100644
--- a/src/holt_container_window.cc
+++ b/src/holt_container_window.cc
@@ -68,7 +68,7 @@ HoltWidget& HoltContainerWindow::get_holt_widget()
 bool 
 HoltContainerWindow::on_button_press_event(GdkEventButton* event)
 {
-  if( (event->type == GDK_BUTTON_PRESS) && (event->button == 3) )
+  if((event->type & Gdk::BUTTON_PRESS) == Gdk::BUTTON_PRESS && (event->button == 3))
   {
     Glib::ustring ui_info = 
     "<ui>"