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-rw-r--r--libs/surfaces/mackie/mackie_control_protocol.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/libs/surfaces/mackie/mackie_control_protocol.cc b/libs/surfaces/mackie/mackie_control_protocol.cc
index eb269ef87c..65a03f483d 100644
--- a/libs/surfaces/mackie/mackie_control_protocol.cc
+++ b/libs/surfaces/mackie/mackie_control_protocol.cc
@@ -70,6 +70,8 @@ using namespace PBD;
#include "i18n.h"
+#include "pbd/abstract_ui.cc" // instantiate template
+
MackieMidiBuilder builder;
#define midi_ui_context() MidiControlUI::instance() /* a UICallback-derived object that specifies the event loop for signal handling */