diff --git a/libraries/AP_Compass/AP_Compass.cpp b/libraries/AP_Compass/AP_Compass.cpp
index 049fde3424..55be015a79 100644
--- a/libraries/AP_Compass/AP_Compass.cpp
+++ b/libraries/AP_Compass/AP_Compass.cpp
@@ -524,6 +524,9 @@ void Compass::_detect_backends(void)
 #elif HAL_COMPASS_DEFAULT == HAL_COMPASS_AK8963_MPU9250_I2C
     _add_backend(AP_Compass_AK8963::probe_mpu9250(*this, hal.i2c_mgr->get_device(HAL_COMPASS_AK8963_I2C_BUS, HAL_COMPASS_AK8963_I2C_ADDR)),
                  AP_Compass_AK8963::name, false);
+#elif HAL_COMPASS_DEFAULT == HAL_COMPASS_AERO
+    _add_backend(AP_Compass_BMM150::probe(*this, hal.i2c_mgr->get_device(HAL_COMPASS_BMM150_I2C_BUS, HAL_COMPASS_BMM150_I2C_ADDR)),
+                 AP_Compass_BMM150::name, false);
 #elif CONFIG_HAL_BOARD == HAL_BOARD_LINUX && CONFIG_HAL_BOARD_SUBTYPE != HAL_BOARD_SUBTYPE_LINUX_NONE
     _add_backend(AP_Compass_HMC5843::probe(*this, hal.i2c_mgr->get_device(HAL_COMPASS_HMC5843_I2C_BUS, HAL_COMPASS_HMC5843_I2C_ADDR)),
                  AP_Compass_HMC5843::name, false);