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-rw-r--r--src/wx/audio_backend.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/wx/audio_backend.h b/src/wx/audio_backend.h
index aa4adf13c..faca6eb0a 100644
--- a/src/wx/audio_backend.h
+++ b/src/wx/audio_backend.h
@@ -24,6 +24,7 @@ LIBDCP_DISABLE_WARNINGS
#include <RtAudio.h>
LIBDCP_ENABLE_WARNINGS
#include <boost/optional.hpp>
+#include <boost/thread/mutex.hpp>