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-rw-r--r--gtk2_ardour/panner2d.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/gtk2_ardour/panner2d.cc b/gtk2_ardour/panner2d.cc
index 35f573bcf1..abb47a9873 100644
--- a/gtk2_ardour/panner2d.cc
+++ b/gtk2_ardour/panner2d.cc
@@ -44,6 +44,7 @@
using namespace std;
using namespace Gtk;
using namespace ARDOUR;
+using namespace ARDOUR_UI_UTILS;
using namespace PBD;
using Gtkmm2ext::Keyboard;