--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -4170,6 +4170,9 @@
 static void
 gtk_window_enable_csd (GtkWindow *window)
 {
+  if (getenv("NOCSD") != NULL) {
+    return;
+  }
   GtkWindowPrivate *priv = window->priv;
   GtkWidget *widget = GTK_WIDGET (window);
   GdkVisual *visual;