diff --git a/sleepyhead/logger.h b/sleepyhead/logger.h
index 3addb091..bcc6c148 100644
--- a/sleepyhead/logger.h
+++ b/sleepyhead/logger.h
@@ -4,6 +4,7 @@
 #include <QDebug>
 #include <QRunnable>
 #include <QThreadPool>
+#include <QMutex>
 #include <QTime>
 
 void initializeLogger();