diff --git a/libraries/AP_HAL_ChibiOS/hwdef/Hitec-Airspeed/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/Hitec-Airspeed/hwdef.dat
index d214a48ee9..a41af41cdc 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/Hitec-Airspeed/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/Hitec-Airspeed/hwdef.dat
@@ -24,17 +24,21 @@ OSCILLATOR_HZ 24000000
 # assume the 128k flash part
 FLASH_SIZE_KB 128
 
+# UARTs disabled to save flash
 # order of UARTs
-SERIAL_ORDER USART1
+# SERIAL_ORDER USART1
+SERIAL_ORDER
+define HAL_USE_UART FALSE
+define HAL_NO_UARTDRIVER TRUE
 
 define HAL_CAN_POOL_SIZE 6000
 
-STDOUT_SERIAL SD1
-STDOUT_BAUDRATE 57600
+# STDOUT_SERIAL SD1
+# STDOUT_BAUDRATE 57600
 
 # USART1, telemetry
-PB6 USART1_TX USART1 SPEED_HIGH
-PB7 USART1_RX USART1 SPEED_HIGH
+# PB6 USART1_TX USART1 SPEED_HIGH
+# PB7 USART1_RX USART1 SPEED_HIGH
 
 # LEDs
 PA10 LED OUTPUT LOW