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-rw-r--r--libs/ardour/plugin.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/libs/ardour/plugin.cc b/libs/ardour/plugin.cc
index 11d859ed8c..14766fca2a 100644
--- a/libs/ardour/plugin.cc
+++ b/libs/ardour/plugin.cc
@@ -264,7 +264,7 @@ Plugin::connect_and_run (BufferSet& bufs,
/* Track notes that we are sending to the plugin */
- MidiBuffer& b = bufs.get_midi (0);
+ const MidiBuffer& b = bufs.get_midi (0);
_tracker.track (b.begin(), b.end());