diff --git a/gtk2_ardour/trigger_ui.h b/gtk2_ardour/trigger_ui.h
index 0207b33064..053a7b20ef 100644
--- a/gtk2_ardour/trigger_ui.h
+++ b/gtk2_ardour/trigger_ui.h
@@ -39,7 +39,7 @@ class TriggerUI
 {
 public:
 	TriggerUI ();
-	~TriggerUI ();
+	virtual ~TriggerUI ();
 
 	void set_trigger (ARDOUR::TriggerReference);