diff --git a/redfish-core/include/subscription.hpp b/redfish-core/include/subscription.hpp
index 2f93f74..e7f1715 100644
--- a/redfish-core/include/subscription.hpp
+++ b/redfish-core/include/subscription.hpp
@@ -75,8 +75,7 @@
     ~Subscription() = default;
 
     // callback for subscription sendData
-    void resHandler(const std::shared_ptr<Subscription>& /*unused*/,
-                    const crow::Response& res);
+    void resHandler(const crow::Response& res);
 
     void sendHeartbeatEvent();
     void scheduleNextHeartbeatEvent();