diff --git a/tasmota/tasmota_xsns_sensor/xsns_53_sml.ino b/tasmota/tasmota_xsns_sensor/xsns_53_sml.ino
index 29ff1b044..4b5109194 100644
--- a/tasmota/tasmota_xsns_sensor/xsns_53_sml.ino
+++ b/tasmota/tasmota_xsns_sensor/xsns_53_sml.ino
@@ -2886,7 +2886,7 @@ init10:
       RtcSettings.pulse_counter[i] = Settings->pulse_counter[i];
       sml_counters[i].sml_cnt_last_ts = millis();
   }
-  uint32_t uart_index = 2;
+  uint32_t uart_index = SOC_UART_NUM - 1;
   sml_counter_pinstate = 0;
   for (uint8_t meters = 0; meters < meters_used; meters++) {
     if (meter_desc_p[meters].type == 'c') {