diff --git a/libs/gtkmm2ext/gtkapplication_quartz.mm b/libs/gtkmm2ext/gtkapplication_quartz.mm
index b628e04140..f83180f4c9 100644
--- a/libs/gtkmm2ext/gtkapplication_quartz.mm
+++ b/libs/gtkmm2ext/gtkapplication_quartz.mm
@@ -1477,10 +1477,8 @@ namespace Gtk {
 @end
 
 static void
-gdk_quartz_modal_notify (GdkWindow* w, gboolean modal)
+gdk_quartz_modal_notify (GdkWindow*, gboolean modal)
 {
-	printf ("modal notify on %p, modal = %d modal_state = %d\n", w, modal, modal_state);
-	PBD::stacktrace (std::cerr, 63);
 	/* this global will control sensitivity of our app menu items, via validateMenuItem */
 	if (modal) {
 		++_modal_state;