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-rw-r--r--libs/ardour/midi_ring_buffer.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/libs/ardour/midi_ring_buffer.cc b/libs/ardour/midi_ring_buffer.cc
index a050422ae5..2d5eedb6eb 100644
--- a/libs/ardour/midi_ring_buffer.cc
+++ b/libs/ardour/midi_ring_buffer.cc
@@ -25,6 +25,7 @@
using namespace std;
using namespace ARDOUR;
+using namespace PBD;
/** Read a block of MIDI events from buffer into a MidiBuffer.
*