diff --git a/libs/ardour/async_midi_port.cc b/libs/ardour/async_midi_port.cc
index e5ea51d976..8c227c50dc 100644
--- a/libs/ardour/async_midi_port.cc
+++ b/libs/ardour/async_midi_port.cc
@@ -25,6 +25,7 @@
 #include <glibmm/timer.h>
 
 #include "pbd/error.h"
+#include "pbd/stacktrace.h"
 
 #include "midi++/types.h"