diff --git a/gtk2_ardour/mixer_ui.cc b/gtk2_ardour/mixer_ui.cc
index 27c58023cd..c8ae5f8a7e 100644
--- a/gtk2_ardour/mixer_ui.cc
+++ b/gtk2_ardour/mixer_ui.cc
@@ -419,6 +419,7 @@ Mixer_UI::~Mixer_UI ()
 	foldback_strip = 0;
 	delete _plugin_selector;
 	delete track_menu;
+	delete _group_tabs;
 }
 
 struct MixerStripSorter {