diff --git a/demos/gtk-demo/drawingarea.c b/demos/gtk-demo/drawingarea.c
index d58c712347..da67ac1f33 100644
--- a/demos/gtk-demo/drawingarea.c
+++ b/demos/gtk-demo/drawingarea.c
@@ -362,7 +362,7 @@ do_drawingarea (GtkWidget *do_widget)
                         G_CALLBACK (scribble_resize), NULL);
 
       drag = gtk_gesture_drag_new ();
-      gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (drag), GDK_BUTTON_PRIMARY);
+      gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (drag), 0);
       gtk_widget_add_controller (da, GTK_EVENT_CONTROLLER (drag));
 
       g_signal_connect (drag, "drag-begin", G_CALLBACK (drag_begin), da);