diff --git a/OpenMQTTGateway.ino b/OpenMQTTGateway.ino
index 2a45a62..eabd21d 100644
--- a/OpenMQTTGateway.ino
+++ b/OpenMQTTGateway.ino
@@ -255,9 +255,12 @@ void setup()
   Serial.begin(SERIAL_BAUD);
   
   #if defined(ESP8266) || defined(ESP32)
+  
     #ifdef ESP8266
-      Serial.end();
-      Serial.begin(SERIAL_BAUD, SERIAL_8N1, SERIAL_TX_ONLY);// enable on ESP8266 to free some pin
+      #ifndef ZgatewaySRFB // if we are not in sonoff rf bridge case we apply the ESP8266 pin optimization
+        Serial.end();
+        Serial.begin(SERIAL_BAUD, SERIAL_8N1, SERIAL_TX_ONLY);// enable on ESP8266 to free some pin
+      #endif
     #endif
     
     #if defined(ESP8266) && !defined(ESPWifiManualSetup)