diff --git a/src/mqtt_client_wrapper.cpp b/src/mqtt_client_wrapper.cpp
index b868120..9f8ba15 100644
--- a/src/mqtt_client_wrapper.cpp
+++ b/src/mqtt_client_wrapper.cpp
@@ -201,7 +201,7 @@ static void on_mqtt_message_received(const std::string &topic, const std::string
 void mqtt_client_thread_func()
 {
     const auto &cfg = g_app_config.mqtt;
-    auto heartbeat_interval = std::chrono::milliseconds(static_cast<int>(cfg.mqtt.keep_alive * 0.9));
+    auto heartbeat_interval = std::chrono::milliseconds(static_cast<int>(cfg.keep_alive * 0.9));
 
     while (g_running)
     {