diff --git a/app/widgets/gimpcriticaldialog.c b/app/widgets/gimpcriticaldialog.c
index 2c7d5b1ea6..f01d7f30f9 100644
--- a/app/widgets/gimpcriticaldialog.c
+++ b/app/widgets/gimpcriticaldialog.c
@@ -116,6 +116,10 @@ gimp_critical_dialog_init (GimpCriticalDialog *dialog)
 
   gtk_dialog_set_default_response (GTK_DIALOG (dialog), GTK_RESPONSE_CLOSE);
   gtk_window_set_resizable (GTK_WINDOW (dialog), TRUE);
+  gtk_window_set_position (GTK_WINDOW (dialog), GTK_WIN_POS_CENTER);
+#if defined(__APPLE__) || defined(_WIN32)
+  gtk_window_set_titlebar (GTK_WINDOW (dialog), NULL);
+#endif
 
   dialog->main_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);
   gtk_container_set_border_width (GTK_CONTAINER (dialog->main_vbox), 6);