diff --git a/gtk2_ardour/splash.cc b/gtk2_ardour/splash.cc
index b606ec6050..ee0566a910 100644
--- a/gtk2_ardour/splash.cc
+++ b/gtk2_ardour/splash.cc
@@ -109,6 +109,7 @@ Splash::pop_back_for (Gtk::Window& win)
 
            So for OS X, we just hide ourselves.
         */
+        (void) win;
         hide();
 #else
 	set_keep_above (false);