diff --git a/lib/TasmotaSerial-3.0.0/src/TasmotaSerial.cpp b/lib/TasmotaSerial-3.0.0/src/TasmotaSerial.cpp
index 7a09518c2..6982779d5 100644
--- a/lib/TasmotaSerial-3.0.0/src/TasmotaSerial.cpp
+++ b/lib/TasmotaSerial-3.0.0/src/TasmotaSerial.cpp
@@ -174,7 +174,9 @@ bool TasmotaSerial::begin(long speed, int stop_bits) {
       m_uart = tasmota_serial_index;
       tasmota_serial_index--;
       TSerial = new HardwareSerial(m_uart);
-      if (TM_SERIAL_BUFFER_SIZE != serial_buffer_size) TSerial->setRxBufferSize(serial_buffer_size);
+      if (serial_buffer_size > 256) {
+        TSerial->setRxBufferSize(serial_buffer_size);
+      }
       if (2 == m_stop_bits) {
         TSerial->begin(speed, SERIAL_8N2, m_rx_pin, m_tx_pin);
       } else {