diff --git a/EKF/ekf_helper.cpp b/EKF/ekf_helper.cpp
index 92f7aa5eb1..30ef13635f 100644
--- a/EKF/ekf_helper.cpp
+++ b/EKF/ekf_helper.cpp
@@ -1247,10 +1247,9 @@ void Ekf::updateBaroHgtOffset()
 float Ekf::getGpsAltVar()
 {
 	// observation variance - receiver defined and parameter limited
-	// use scaled horizontal position accuracy assuming typical ratio of VDOP/HDOP
 	const float lower_limit = fmaxf(_params.gps_pos_noise, 0.01f);
 	const float upper_limit = fmaxf(_params.pos_noaid_noise, lower_limit);
-	const float gps_alt_var = sq(1.5f * math::constrain(_gps_sample_delayed.vacc, lower_limit, upper_limit));
+	const float gps_alt_var = sq(math::constrain(_gps_sample_delayed.vacc, lower_limit, upper_limit));
 	return gps_alt_var;
 }