diff --git a/gtk2_ardour/ardour_ui2.cc b/gtk2_ardour/ardour_ui2.cc
index b978a32892..0141e76814 100644
--- a/gtk2_ardour/ardour_ui2.cc
+++ b/gtk2_ardour/ardour_ui2.cc
@@ -371,7 +371,9 @@ ARDOUR_UI::setup_transport ()
 	ARDOUR_UI::Clock.connect (sigc::bind (sigc::mem_fun (secondary_clock, &MainClock::set), false));
 
 	primary_clock->ValueChanged.connect (sigc::mem_fun(*this, &ARDOUR_UI::primary_clock_value_changed));
+	primary_clock->change_display_delta_mode_signal.connect (sigc::mem_fun(UIConfiguration::instance(), &UIConfiguration::set_primary_clock_delta_mode));
 	secondary_clock->ValueChanged.connect (sigc::mem_fun(*this, &ARDOUR_UI::secondary_clock_value_changed));
+	secondary_clock->change_display_delta_mode_signal.connect (sigc::mem_fun(UIConfiguration::instance(), &UIConfiguration::set_secondary_clock_delta_mode));
 	big_clock->ValueChanged.connect (sigc::mem_fun(*this, &ARDOUR_UI::big_clock_value_changed));
 
 	editor_visibility_button.signal_drag_failed().connect (sigc::bind (sigc::ptr_fun (drag_failed), editor));
diff --git a/gtk2_ardour/main_clock.cc b/gtk2_ardour/main_clock.cc
index d76577b4dc..f038b939c4 100644
--- a/gtk2_ardour/main_clock.cc
+++ b/gtk2_ardour/main_clock.cc
@@ -120,11 +120,7 @@ MainClock::change_display_delta_mode (ClockDeltaMode m)
 	if (_suspend_delta_mode_signal) {
 		return;
 	}
-	if (_primary) {
-		UIConfiguration::instance().set_primary_clock_delta_mode (m);
-	} else {
-		UIConfiguration::instance().set_secondary_clock_delta_mode (m);
-	}
+	change_display_delta_mode_signal (m);
 }
 
 void
diff --git a/gtk2_ardour/main_clock.h b/gtk2_ardour/main_clock.h
index 11a086977e..4d26996cb0 100644
--- a/gtk2_ardour/main_clock.h
+++ b/gtk2_ardour/main_clock.h
@@ -32,6 +32,7 @@ public:
 	void set_session (ARDOUR::Session *s);
 	void set_display_delta_mode (ARDOUR::ClockDeltaMode m);
 	void set (Temporal::timepos_t const &, bool force = false);
+	sigc::signal<bool, ARDOUR::ClockDeltaMode> change_display_delta_mode_signal;
 
 private:
 	void build_ops_menu ();