diff --git a/variants/m5stack_fire/pins_arduino.h b/variants/m5stack_fire/pins_arduino.h
index bef0491a2f0..8b86a0d6fdc 100644
--- a/variants/m5stack_fire/pins_arduino.h
+++ b/variants/m5stack_fire/pins_arduino.h
@@ -14,6 +14,9 @@
 static const uint8_t TX = 1;
 static const uint8_t RX = 3;
 
+static const uint8_t TXD2 = 17;
+static const uint8_t RXD2 = 16;
+
 static const uint8_t SDA = 21;
 static const uint8_t SCL = 22;