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-rw-r--r--gtk2_ardour/ardour_ui_options.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/gtk2_ardour/ardour_ui_options.cc b/gtk2_ardour/ardour_ui_options.cc
index f8dab139ad..638743897b 100644
--- a/gtk2_ardour/ardour_ui_options.cc
+++ b/gtk2_ardour/ardour_ui_options.cc
@@ -45,6 +45,7 @@ using namespace Gtk;
using namespace Gtkmm2ext;
using namespace ARDOUR;
using namespace PBD;
+using namespace ArdourWidgets;
void
ARDOUR_UI::toggle_external_sync()