diff --git a/libraries/AP_HAL_ChibiOS/hwdef/ReaperF745v2/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/ReaperF745v2/hwdef.dat
index 30aa3ae55c..003b927b2e 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/ReaperF745v2/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/ReaperF745v2/hwdef.dat
@@ -123,8 +123,9 @@ SPIDEV bmi270    SPI3 DEVID1 BMI270_CS  MODE3  1*MHZ  4*MHZ
 SPIDEV dataflash SPI4 DEVID1 FLASH_CS   MODE3 32*MHZ 32*MHZ
 SPIDEV osd       SPI1 DEVID1 AT7456E_CS MODE0 10*MHZ 10*MHZ
 
-# no built-in compass and no external I2C so no compass
+# no built-in compass
 define ALLOW_ARM_NO_COMPASS
+define HAL_PROBE_EXTERNAL_I2C_COMPASSES
 define HAL_I2C_INTERNAL_MASK 0
 
 # one IMU bmi270