diff --git a/include/chaiscript/dispatchkit/handle_return.hpp b/include/chaiscript/dispatchkit/handle_return.hpp
index e0a3b132..e0d4e3ae 100644
--- a/include/chaiscript/dispatchkit/handle_return.hpp
+++ b/include/chaiscript/dispatchkit/handle_return.hpp
@@ -126,7 +126,7 @@ namespace chaiscript {
       struct Handle_Return_Ref {
         template<typename T>
         static Boxed_Value handle(T &&r) {
-          return Boxed_Value(std::cref(r), true);
+          return Boxed_Value(std::cref(r), false);
         }
       };
 
diff --git a/unittests/map_keys_vector_push_back.chai b/unittests/map_keys_vector_push_back.chai
new file mode 100644
index 00000000..2310e846
--- /dev/null
+++ b/unittests/map_keys_vector_push_back.chai
@@ -0,0 +1,29 @@
+// Regression test for issue #594
+// Map keys pushed into a vector via .first should remain valid
+// after the map goes out of scope.
+
+def keys(Map map)
+{
+  var v = Vector();
+  for( i : map )
+  {
+    v.push_back(i.first);
+  }
+  return v;
+}
+
+var k = Vector();
+if ( true )
+{
+  var m = ["a":"x", "b":"y", "c":"z"];
+  k = keys(m);
+}
+
+// After the map is out of scope, the keys should still be valid strings
+assert_equal(3, k.size())
+
+// Verify each element is a non-empty string
+for (elem : k)
+{
+  assert_true(elem.size() > 0)
+}