diff --git a/.clang-tidy-ci b/.clang-tidy-ci
index e34647139bb06..bfce1237e779b 100644
--- a/.clang-tidy-ci
+++ b/.clang-tidy-ci
@@ -18,8 +18,7 @@ Checks: "
   -bugprone-signed-char-misuse,
   -bugprone-switch-missing-default-case,
   -bugprone-unchecked-optional-access,
-  -bugprone-unused-local-non-trivial-variable,
-  -bugprone-unused-return-value"
+  -bugprone-unused-local-non-trivial-variable"
 
 WarningsAsErrors: "*"
 
diff --git a/system/autoware_system_monitor/reader/traffic_reader/traffic_reader_service.cpp b/system/autoware_system_monitor/reader/traffic_reader/traffic_reader_service.cpp
index a0f8e45f5adfc..7917b3c66a46d 100644
--- a/system/autoware_system_monitor/reader/traffic_reader/traffic_reader_service.cpp
+++ b/system/autoware_system_monitor/reader/traffic_reader/traffic_reader_service.cpp
@@ -80,7 +80,7 @@ void TrafficReaderService::run()
 
     // Accept a new connection
     boost::system::error_code error_code;
-    acceptor_->accept(*socket_, error_code);
+    error_code = acceptor_->accept(*socket_, error_code);
 
     if (error_code) {
       syslog(LOG_ERR, "Failed to accept new connection. %s\n", error_code.message().c_str());
diff --git a/system/autoware_system_monitor/src/net_monitor/net_monitor.cpp b/system/autoware_system_monitor/src/net_monitor/net_monitor.cpp
index 859328ce33005..6eecbedb8535f 100644
--- a/system/autoware_system_monitor/src/net_monitor/net_monitor.cpp
+++ b/system/autoware_system_monitor/src/net_monitor/net_monitor.cpp
@@ -664,7 +664,7 @@ bool NetMonitor::connect_service()
 
   // Connect socket
   boost::system::error_code error_code;
-  socket_->connect(endpoint, error_code);
+  error_code = socket_->connect(endpoint, error_code);
 
   if (error_code) {
     RCLCPP_ERROR_ONCE(get_logger(), "Failed to connect socket. %s", error_code.message().c_str());