diff --git a/src/system.h b/src/system.h
index 8ccbd4ee9..b8e6e0ae2 100644
--- a/src/system.h
+++ b/src/system.h
@@ -82,6 +82,8 @@ class System {
     void send_heartbeat();
     void send_info_mqtt();
 
+    std::string getMacAddress() const;
+
     bool syslog_enabled() {
         return syslog_enabled_;
     }