diff --git a/gtk2_ardour/ruler_dialog.cc b/gtk2_ardour/ruler_dialog.cc
index 10d0b2c7c2..3285d9a380 100644
--- a/gtk2_ardour/ruler_dialog.cc
+++ b/gtk2_ardour/ruler_dialog.cc
@@ -49,7 +49,6 @@ RulerDialog::RulerDialog ()
 	connect_action (timecode_button, "timecode-ruler");
 	connect_action (minsec_button, "minsec-ruler");
 	connect_action (bbt_button, "bbt-ruler");
-	connect_action (mapping_button, "mapping-ruler");
 	connect_action (tempo_button, "tempo-ruler");
 	connect_action (meter_button, "meter-ruler");
 	connect_action (loop_punch_button, "loop-punch-ruler");