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-rw-r--r--gtk2_ardour/option_editor.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/gtk2_ardour/option_editor.cc b/gtk2_ardour/option_editor.cc
index 5ac4bf5a8d..d4c2715742 100644
--- a/gtk2_ardour/option_editor.cc
+++ b/gtk2_ardour/option_editor.cc
@@ -43,6 +43,7 @@
#include "i18n.h"
using namespace ARDOUR;
+using namespace PBD;
using namespace Gtk;
using namespace Editing;
using namespace Gtkmm2ext;