diff --git a/libraries/AP_HAL_ChibiOS/hwdef/mini-pix/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/mini-pix/hwdef.dat
index aebe028540..ec99b246d6 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/mini-pix/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/mini-pix/hwdef.dat
@@ -24,7 +24,7 @@ FLASH_SIZE_KB 1024
 I2C_ORDER I2C2 I2C1
 
 # order of UARTs (and USB)
-SERIAL_ORDER OTG1 USART3 USART2 UART4 USART6
+SERIAL_ORDER OTG1 USART3 USART2 UART4
 
 # UART4 serial GPS
 PA0 UART4_TX UART4
@@ -73,8 +73,6 @@ PC4 SAFETY_IN INPUT
 # default to RCIN using timer capture
 PC7 TIM8_CH2 TIM8 RCININT PULLDOWN
 
-# alternative using USART6
-PC7 USART6_RX USART6 NODMA ALT(1)
 
 PC8 SDIO_D0 SDIO
 PC9 SDIO_D1 SDIO