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-rw-r--r--libs/surfaces/control_protocol/control_protocol.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/libs/surfaces/control_protocol/control_protocol.cc b/libs/surfaces/control_protocol/control_protocol.cc
index 7a218e8532..52aaa51e6e 100644
--- a/libs/surfaces/control_protocol/control_protocol.cc
+++ b/libs/surfaces/control_protocol/control_protocol.cc
@@ -20,6 +20,7 @@
#include "pbd/error.h"
+#include "ardour/gain_control.h"
#include "ardour/session.h"
#include "ardour/route.h"
#include "ardour/audio_track.h"