diff --git a/interface/src/FileLogger.h b/interface/src/FileLogger.h
index e0cd0c5d5e..6a17032ae2 100644
--- a/interface/src/FileLogger.h
+++ b/interface/src/FileLogger.h
@@ -10,6 +10,7 @@
 #define hifi_FileLogger_h
 
 #include "AbstractLoggerInterface.h"
+#include <QMutex>
 
 class FileLogger : public AbstractLoggerInterface {
     Q_OBJECT