diff --git a/include/boost/parser/parser.hpp b/include/boost/parser/parser.hpp
index f1e3434c..353e6c72 100644
--- a/include/boost/parser/parser.hpp
+++ b/include/boost/parser/parser.hpp
@@ -1581,7 +1581,7 @@ namespace boost { namespace parser {
         {
             std::optional<T> retval;
             if (success)
-                retval = x;
+                retval = std::move(x);
             return retval;
         }