diff --git a/src/cpp/re/edit/Notification.h b/src/cpp/re/edit/Notification.h
index e4e7bbc..5489391 100644
--- a/src/cpp/re/edit/Notification.h
+++ b/src/cpp/re/edit/Notification.h
@@ -23,6 +23,7 @@
 #include <vector>
 #include <string>
 #include <chrono>
+#include <optional>
 
 namespace re::edit::ReGui {