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-rw-r--r--libs/backends/portaudio/winmmemidi_io.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/libs/backends/portaudio/winmmemidi_io.cc b/libs/backends/portaudio/winmmemidi_io.cc
index d845e60551..00e3eb0182 100644
--- a/libs/backends/portaudio/winmmemidi_io.cc
+++ b/libs/backends/portaudio/winmmemidi_io.cc
@@ -20,6 +20,7 @@
#include <mmsystem.h>
#include <sstream>
+#include <set>
#include "pbd/error.h"
#include "pbd/compose.h"