diff --git a/src/fdrs_gateway_serial.h b/src/fdrs_gateway_serial.h
index 9d092b2..869f2e2 100644
--- a/src/fdrs_gateway_serial.h
+++ b/src/fdrs_gateway_serial.h
@@ -6,7 +6,7 @@
 #define UART_IF Serial
 #endif
 
-#if defined(ESP32) || defined(ESP8266)
+#if defined(ESP32)
 #if !defined RXD2 or !defined TXD2
     #warning Defining RXD2 and TXD2 using MCU defaults.
     #if CONFIG_IDF_TARGET_ESP32