diff --git a/include/fc/optional.hpp b/include/fc/optional.hpp
index df6e1f2..ff6c789 100644
--- a/include/fc/optional.hpp
+++ b/include/fc/optional.hpp
@@ -1,6 +1,7 @@
 #pragma once
 #include <fc/utility.hpp>
 #include <assert.h>
+#include <utility>
 
 
 namespace fc {