diff --git a/boards/px4/fmu-v4/init/rc.board_sensors b/boards/px4/fmu-v4/init/rc.board_sensors
index 6b59c41169f..5e4e816f0d3 100644
--- a/boards/px4/fmu-v4/init/rc.board_sensors
+++ b/boards/px4/fmu-v4/init/rc.board_sensors
@@ -19,7 +19,7 @@ ist8310 start
 bmp280 -I start
 
 # expansion i2c used for BMM150 rotated by 90deg
-bmm150 -R 2 start
+bmm150 -X -R 2 start
 
 # For Teal One airframe
 if param compare SYS_AUTOSTART 4250
diff --git a/src/drivers/magnetometer/bmm150/bmm150.cpp b/src/drivers/magnetometer/bmm150/bmm150.cpp
index cc7d5fe2ca8..21c0fb90e14 100644
--- a/src/drivers/magnetometer/bmm150/bmm150.cpp
+++ b/src/drivers/magnetometer/bmm150/bmm150.cpp
@@ -86,8 +86,12 @@ void start(bool external_bus, enum Rotation rotation)
 #endif
 
 	} else {
+#if defined(PX4_I2C_BUS_ONBOARD)
+		*g_dev_ptr = new BMM150(PX4_I2C_BUS_ONBOARD, path, rotation);
+#else
 		PX4_ERR("Internal I2C not available");
 		exit(0);
+#endif
 	}
 
 	if (*g_dev_ptr == nullptr) {