diff --git a/redfish-core/include/server_sent_events.hpp b/redfish-core/include/server_sent_events.hpp
index 1592d50..695c483 100644
--- a/redfish-core/include/server_sent_events.hpp
+++ b/redfish-core/include/server_sent_events.hpp
@@ -113,7 +113,7 @@
         sseConn->async_write_some(
             boost::asio::buffer(outBuffer.data(), outBuffer.size()),
             [self(shared_from_this())](
-                boost::beast::error_code ec,
+                const boost::beast::error_code& ec,
                 [[maybe_unused]] const std::size_t& bytesTransferred) {
             self->outBuffer.erase(0, bytesTransferred);
 
diff --git a/redfish-core/lib/aggregation_service.hpp b/redfish-core/lib/aggregation_service.hpp
index 9874d14..6c93613 100644
--- a/redfish-core/lib/aggregation_service.hpp
+++ b/redfish-core/lib/aggregation_service.hpp
@@ -66,7 +66,7 @@
 
 inline void populateAggregationSourceCollection(
     const std::shared_ptr<bmcweb::AsyncResp>& asyncResp,
-    const boost::system::error_code ec,
+    const boost::system::error_code& ec,
     const std::unordered_map<std::string, boost::urls::url>& satelliteInfo)
 {
     // Something went wrong while querying dbus
@@ -138,7 +138,7 @@
 inline void populateAggregationSource(
     const std::string& aggregationSourceId,
     const std::shared_ptr<bmcweb::AsyncResp>& asyncResp,
-    const boost::system::error_code ec,
+    const boost::system::error_code& ec,
     const std::unordered_map<std::string, boost::urls::url>& satelliteInfo)
 {
     asyncResp->res.addHeader(
diff --git a/redfish-core/lib/systems.hpp b/redfish-core/lib/systems.hpp
index 736b158..1cedf2d 100644
--- a/redfish-core/lib/systems.hpp
+++ b/redfish-core/lib/systems.hpp
@@ -2974,7 +2974,7 @@
         if (protocolName == "SSH")
         {
             getPortNumber(socketPath, [asyncResp, protocolName](
-                                          const boost::system::error_code ec1,
+                                          const boost::system::error_code& ec1,
                                           int portNumber) {
                 if (ec1)
                 {
diff --git a/redfish-core/lib/update_service.hpp b/redfish-core/lib/update_service.hpp
index 7c8ce01..ddb46f6 100644
--- a/redfish-core/lib/update_service.hpp
+++ b/redfish-core/lib/update_service.hpp
@@ -575,7 +575,7 @@
 
     // Set the requested image apply time value
     crow::connections::systemBus->async_method_call(
-        [asyncResp](const boost::system::error_code ec) {
+        [asyncResp](const boost::system::error_code& ec) {
         if (ec)
         {
             BMCWEB_LOG_ERROR << "D-Bus responses error: " << ec;