diff --git a/src/modules/mavlink/streams/HIGHRES_IMU.hpp b/src/modules/mavlink/streams/HIGHRES_IMU.hpp
index d4866923a050..694edefb5779 100644
--- a/src/modules/mavlink/streams/HIGHRES_IMU.hpp
+++ b/src/modules/mavlink/streams/HIGHRES_IMU.hpp
@@ -63,7 +63,7 @@ class MavlinkStreamHighresIMU : public MavlinkStream
 private:
 	explicit MavlinkStreamHighresIMU(Mavlink *mavlink) : MavlinkStream(mavlink) {}
 
-	uORB::SubscriptionMultiArray<vehicle_imu_s, 3> _vehicle_imu_subs{ORB_ID::vehicle_imu};
+	uORB::SubscriptionMultiArray<vehicle_imu_s, 4> _vehicle_imu_subs{ORB_ID::vehicle_imu};
 	uORB::Subscription _estimator_sensor_bias_sub{ORB_ID(estimator_sensor_bias)};
 	uORB::Subscription _estimator_selector_status_sub{ORB_ID(estimator_selector_status)};
 	uORB::Subscription _sensor_selection_sub{ORB_ID(sensor_selection)};