diff --git a/libs/gtkmm2ext/gtk_ui.cc b/libs/gtkmm2ext/gtk_ui.cc
index 24b3ede59d..8fa9085554 100644
--- a/libs/gtkmm2ext/gtk_ui.cc
+++ b/libs/gtkmm2ext/gtk_ui.cc
@@ -50,6 +50,7 @@
 #include "gtkmm2ext/activatable.h"
 #include "gtkmm2ext/actions.h"
 #include "gtkmm2ext/gui_thread.h"
+#include "gtkmm2ext/ui_config.h"
 
 #include "pbd/i18n.h"
 
@@ -695,7 +696,7 @@ UI::toggle_errors ()
 {
 	Glib::RefPtr<ToggleAction> tact = ActionManager::get_toggle_action (X_("Editor"), X_("toggle-log-window"));
 	if (tact->get_active()) {
-		errors->set_position (WIN_POS_MOUSE);
+		errors->set_position (UIConfigurationBase::instance().get_default_window_position());
 		errors->show ();
 	} else {
 		errors->hide ();
@@ -730,7 +731,7 @@ UI::handle_fatal (const char *message)
 	title += ": Fatal Error";
 	win.set_title (title.get_string());
 
-	win.set_position (WIN_POS_MOUSE);
+	win.set_position (UIConfigurationBase::instance().get_default_window_position());
 	win.set_border_width (12);
 
 	win.get_vbox()->pack_start (label, true, true);
@@ -760,7 +761,7 @@ UI::popup_error (const string& text)
 	MessageDialog msg (text);
 	msg.set_title (string_compose (_("I'm sorry %1, I can't do that"), g_get_user_name()));
 	msg.set_wmclass (X_("error"), Glib::get_application_name());
-	msg.set_position (WIN_POS_MOUSE);
+	msg.set_position (UIConfigurationBase::instance().get_default_window_position());
 	msg.run ();
 }