diff --git a/include/Utils.hpp b/include/Utils.hpp
index c08daf9..bb15bb0 100644
--- a/include/Utils.hpp
+++ b/include/Utils.hpp
@@ -12,6 +12,7 @@
 #include <functional>
 #include <iostream>
 #include <memory>
+#include <optional>
 #include <regex>
 #include <string>
 #include <tuple>