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-rw-r--r--libs/ardour/midi_ui.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/libs/ardour/midi_ui.cc b/libs/ardour/midi_ui.cc
index fb85309ee1..be13209513 100644
--- a/libs/ardour/midi_ui.cc
+++ b/libs/ardour/midi_ui.cc
@@ -34,6 +34,7 @@
using namespace std;
using namespace ARDOUR;
+using namespace PBD;
using namespace Glib;
#include "i18n.h"