diff --git a/src/macos/PreferencesPolicy.hh b/src/macos/PreferencesPolicy.hh
index a9a578e..014b65b 100644
--- a/src/macos/PreferencesPolicy.hh
+++ b/src/macos/PreferencesPolicy.hh
@@ -8,6 +8,7 @@
 
 #include <napi.h>
 #include <CoreFoundation/CoreFoundation.h>
+#include <optional>
 #include "../Policy.hh"
 
 using namespace Napi;
@@ -69,4 +70,4 @@ protected:
 
 private:
 };
-#endif
\ No newline at end of file
+#endif