diff --git a/libraries/AP_HAL_ChibiOS/hwdef/CUAV_GPS/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/CUAV_GPS/hwdef.dat
index 77d51beda2..8c9c716f39 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/CUAV_GPS/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/CUAV_GPS/hwdef.dat
@@ -152,6 +152,7 @@ define AP_PARAM_MAX_EMBEDDED_PARAM 0
 # disable dual GPS and GPS blending to save flash space
 define GPS_MAX_RECEIVERS 1
 define GPS_MAX_INSTANCES 1
+define HAL_COMPASS_MAX_SENSORS 1
 
 # GPS+MAG+BARO+Buzzer+NeoPixels
 define HAL_PERIPH_ENABLE_GPS
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/f103-periph/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/f103-periph/hwdef.dat
index b15e3e3a95..408a9540d2 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/f103-periph/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/f103-periph/hwdef.dat
@@ -141,6 +141,7 @@ define HAL_I2C_INTERNAL_MASK 0
 # disable dual GPS and GPS blending to save flash space
 define GPS_MAX_RECEIVERS 1
 define GPS_MAX_INSTANCES 1
+define HAL_COMPASS_MAX_SENSORS 1
 
 # GPS+MAG
 define HAL_PERIPH_ENABLE_GPS