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-rw-r--r--gtk2_ardour/plugin_ui.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/gtk2_ardour/plugin_ui.cc b/gtk2_ardour/plugin_ui.cc
index 66231adcc3..749ab9d4ac 100644
--- a/gtk2_ardour/plugin_ui.cc
+++ b/gtk2_ardour/plugin_ui.cc
@@ -56,6 +56,7 @@
using namespace std;
using namespace ARDOUR;
+using namespace PBD;
using namespace Gtkmm2ext;
using namespace Gtk;
using namespace sigc;