diff --git a/redfish-core/lib/task.hpp b/redfish-core/lib/task.hpp
index 95fa0c0..2e7481a 100644
--- a/redfish-core/lib/task.hpp
+++ b/redfish-core/lib/task.hpp
@@ -63,7 +63,7 @@
             return;
         }
 
-        for (const auto& field : req.fields)
+        for (const auto& field : req.fields())
         {
             if (std::find(headerWhitelist.begin(), headerWhitelist.end(),
                           field.name()) == headerWhitelist.end())