diff --git a/tasmota/xdrv_10_rules.ino b/tasmota/xdrv_10_rules.ino
index be0ba7a98..fdb23f036 100644
--- a/tasmota/xdrv_10_rules.ino
+++ b/tasmota/xdrv_10_rules.ino
@@ -758,11 +758,9 @@ bool RuleSetProcess(uint8_t rule_set, String &event_saved)
       RulesVarReplace(commands, F("%TOPIC%"), mqtt_topic);
       snprintf_P(stemp, sizeof(stemp), PSTR("%06X"), ESP_getChipId());
       RulesVarReplace(commands, F("%DEVICEID%"), stemp);
-      char macaddr[13];
       String mac_address = WiFi.macAddress();
       mac_address.replace(":", "");
-      snprintf_P(macaddr, sizeof(macaddr), PSTR("%s"), mac_address.c_str());
-      RulesVarReplace(commands, F("%MACADDR%"), macaddr);
+      RulesVarReplace(commands, F("%MACADDR%"), mac_address);
 #if defined(USE_TIMERS) && defined(USE_SUNRISE)
       RulesVarReplace(commands, F("%SUNRISE%"), String(SunMinutes(0)));
       RulesVarReplace(commands, F("%SUNSET%"), String(SunMinutes(1)));