diff --git a/variants/ioxgd4/pins_arduino.h b/variants/ioxgd4/pins_arduino.h
index 3e10e21..08eda38 100644
--- a/variants/ioxgd4/pins_arduino.h
+++ b/variants/ioxgd4/pins_arduino.h
@@ -59,8 +59,8 @@ extern class UARTClass Serial3;
 #define RX0                   4
 #define TX0                   5
 
-#define RX1                   6
-#define TX1                   7
+#define RX1                   7
+#define TX1                   6
 
 #define SDA                  33
 #define SCL                  32