diff --git a/redfish-core/include/error_messages.hpp b/redfish-core/include/error_messages.hpp
index c9a919a..5bee7b0 100644
--- a/redfish-core/include/error_messages.hpp
+++ b/redfish-core/include/error_messages.hpp
@@ -785,9 +785,9 @@
  * @param[in] arg1 Parameter of message that will replace %1 in its body.
  *
  * @returns Message InvalidIndex formatted to JSON */
-nlohmann::json invalidIndex(const int& arg1);
+nlohmann::json invalidIndex(int64_t arg1);
 
-void invalidIndex(crow::Response& res, const int& arg1);
+void invalidIndex(crow::Response& res, int64_t arg1);
 
 /**
  * @brief Formats EmptyJSON message into JSON
diff --git a/redfish-core/src/error_messages.cpp b/redfish-core/src/error_messages.cpp
index cb4d69c..3fd48a2 100644
--- a/redfish-core/src/error_messages.cpp
+++ b/redfish-core/src/error_messages.cpp
@@ -1750,7 +1750,7 @@
  * See header file for more information
  * @endinternal
  */
-nlohmann::json invalidIndex(const int& arg1)
+nlohmann::json invalidIndex(int64_t arg1)
 {
     return nlohmann::json{
         {"@odata.type", "#Message.v1_1_1.Message"},
@@ -1763,7 +1763,7 @@
                        "bounds of the array."}};
 }
 
-void invalidIndex(crow::Response& res, const int& arg1)
+void invalidIndex(crow::Response& res, int64_t arg1)
 {
     res.result(boost::beast::http::status::bad_request);
     addMessageToErrorJson(res.jsonValue, invalidIndex(arg1));