diff --git a/EKF/ekf.cpp b/EKF/ekf.cpp
index 81d0ed7428..427428c448 100644
--- a/EKF/ekf.cpp
+++ b/EKF/ekf.cpp
@@ -269,8 +269,8 @@ void Ekf::predictState()
 	// calculate a filtered horizontal acceleration with a 1 sec time constant
 	// this are used for manoeuvre detection elsewhere
 	float alpha = 1.0f - _imu_sample_delayed.delta_vel_dt;
-	_accel_lpf_NE(0) = _accel_lpf_NE(0) * alpha + corrected_delta_vel_ef(0);
-	_accel_lpf_NE(1) = _accel_lpf_NE(1) * alpha + corrected_delta_vel_ef(1);
+	_accel_lpf_NE = _accel_lpf_NE * alpha + corrected_delta_vel_ef.xy();
+
 	// save the previous value of velocity so we can use trapzoidal integration
 	const Vector3f vel_last = _state.vel;