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-rw-r--r--libs/midi++2/midicontrollable.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/libs/midi++2/midicontrollable.cc b/libs/midi++2/midicontrollable.cc
index 24bc381255..bb98678854 100644
--- a/libs/midi++2/midicontrollable.cc
+++ b/libs/midi++2/midicontrollable.cc
@@ -26,6 +26,7 @@
using namespace sigc;
using namespace MIDI;
+using namespace PBD;
Controllable::Controllable (Port *p, bool is_bistate)
{