diff --git a/libraries/AP_HAL_ChibiOS/hwdef/omnibusf4pro/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/omnibusf4pro/hwdef.dat
index 052a5d2550..b7deaa719e 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/omnibusf4pro/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/omnibusf4pro/hwdef.dat
@@ -103,6 +103,9 @@ define HAL_COMPASS_DEFAULT HAL_COMPASS_HMC5843
 define HAL_COMPASS_HMC5843_I2C_BUS 0
 define HAL_COMPASS_HMC5843_I2C_ADDR 0x1E
 
+# there is no compass fitted by default
+define ALLOW_ARM_NO_COMPASS
+
 define STORAGE_FLASH_PAGE 1
 define HAL_STORAGE_SIZE 15360