diff --git a/gtk2_ardour/mixer_strip.cc b/gtk2_ardour/mixer_strip.cc
index 4861efd07c..833b713583 100644
--- a/gtk2_ardour/mixer_strip.cc
+++ b/gtk2_ardour/mixer_strip.cc
@@ -307,6 +307,10 @@ MixerStrip::~MixerStrip ()
 	if (output_selector) {
 		delete output_selector;
 	}
+	
+	if(comment_window) {
+		delete comment_window;
+	}
 }
 
 void