diff --git a/include/ui/eventpixmapitem.h b/include/ui/eventpixmapitem.h
index 2f231a95..ac16c31d 100644
--- a/include/ui/eventpixmapitem.h
+++ b/include/ui/eventpixmapitem.h
@@ -7,6 +7,7 @@
 #include <QGraphicsItemAnimation>
 
 #include <QtWidgets>
+#include <optional>
 
 #include "events.h"