diff --git a/src/support/FileMonitor.h b/src/support/FileMonitor.h
index 07a8dc532c..622637efa4 100644
--- a/src/support/FileMonitor.h
+++ b/src/support/FileMonitor.h
@@ -20,6 +20,7 @@
 #include "support/signals.h"
 
 #include <memory>
+#include <map>
 
 #include <QFileSystemWatcher>
 #include <QObject>