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-rw-r--r--gtk2_ardour/editor_rulers.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/gtk2_ardour/editor_rulers.cc b/gtk2_ardour/editor_rulers.cc
index e44f6a55eb..47641655e7 100644
--- a/gtk2_ardour/editor_rulers.cc
+++ b/gtk2_ardour/editor_rulers.cc
@@ -35,6 +35,7 @@
using namespace sigc;
using namespace ARDOUR;
+using namespace PBD;
using namespace Gtk;
using namespace Editing;