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-rw-r--r--gtk2_ardour/mixer_strip.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/gtk2_ardour/mixer_strip.cc b/gtk2_ardour/mixer_strip.cc
index 3a8881916c..47d884be5e 100644
--- a/gtk2_ardour/mixer_strip.cc
+++ b/gtk2_ardour/mixer_strip.cc
@@ -63,6 +63,7 @@
using namespace sigc;
using namespace ARDOUR;
+using namespace PBD;
using namespace Gtk;
using namespace Gtkmm2ext;