diff --git a/a8/lisp.cc b/a8/lisp.cc
index d767580..8581093 100644
--- a/a8/lisp.cc
+++ b/a8/lisp.cc
@@ -200,7 +200,7 @@ namespace a8
                     break;
                 case ValueType::kList:
                     {
-                        List&& list = std::any_cast<List>(x->value);
+                        List list = std::any_cast<List>(x->value);
                         auto leader = list->at(0);
                         if (leader->type == ValueType::kCProc) {
                             CProc&& cproc = std::any_cast<CProc>(leader->value);