diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/Calendar.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/Calendar.cpp
index c21cd5f030..cf64642c65 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/Calendar.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/Calendar.cpp
@@ -97,7 +97,7 @@ Vector<String> calendar_fields(GlobalObject& global_object, Object& calendar, Ve
         return {};
 
     // 2. Let fieldsArray be ! CreateArrayFromList(fieldNames).
-    Vector<Value> field_names_values;
+    auto field_names_values = MarkedValueList { vm.heap() };
     for (auto& field_name : field_names)
         field_names_values.append(js_string(vm, field_name));
     Value fields_array = Array::create_from(global_object, field_names_values);