diff --git a/framesenderwindow.h b/framesenderwindow.h
index 8a5cd94..c07531d 100644
--- a/framesenderwindow.h
+++ b/framesenderwindow.h
@@ -5,6 +5,7 @@
 #include <QTimer>
 #include <QElapsedTimer>
 #include <QTime>
+#include <QMutex>
 #include "can_structs.h"
 #include "can_trigger_structs.h"