diff --git a/lib/radio_esp8266.c b/lib/radio_esp8266.c
index 9dd5655..bd66c23 100644
--- a/lib/radio_esp8266.c
+++ b/lib/radio_esp8266.c
@@ -38,7 +38,7 @@
 /** @defgroup radio_esp8266_usart USART peripheral used for communication with radio
  *  @{
  */
-#define RADIO_ESP8266_USART 1 /**< USART peripheral */
+#define RADIO_ESP8266_USART 2 /**< USART peripheral */
 /** @} */
 
 /* input and output buffers and used memory */