diff --git a/gtk2_ardour/ardour_ui.cc b/gtk2_ardour/ardour_ui.cc
index 8487d1d547..b5fe18e91f 100644
--- a/gtk2_ardour/ardour_ui.cc
+++ b/gtk2_ardour/ardour_ui.cc
@@ -162,6 +162,7 @@ ARDOUR_UI::ARDOUR_UI (int *argcp, char **argvp[], const char* localedir)
 	, _was_dirty (false)
 	, _mixer_on_top (false)
 	, first_time_engine_run (true)
+	, blink_timeout_tag (-1)
 
 	  /* transport */