diff --git a/localehelper.h b/localehelper.h
index 3071217..6ed1cba 100644
--- a/localehelper.h
+++ b/localehelper.h
@@ -4,7 +4,6 @@
 #include "./global.h"
 
 #include <cstdint>
-#include <optional>
 #include <string>
 #include <utility>
 #include <vector>