diff --git a/EKF/ekf.cpp b/EKF/ekf.cpp
index 3c8de0ae87..8477e3d36e 100644
--- a/EKF/ekf.cpp
+++ b/EKF/ekf.cpp
@@ -270,10 +270,11 @@ bool Ekf::update()
 
 			} else {
 				// calculate a filtered offset between the baro origin and local NED origin if we are not using the baro  as a height reference
-				float dt = math::constrain(1e-6f*(float)(_baro_sample_delayed.time_us - last_baro_time_us),0.0f,1.0f);
+				float local_time_step = 1e-6f*(float)(_baro_sample_delayed.time_us - last_baro_time_us);
+				local_time_step = math::constrain(local_time_step,0.0f,1.0f);
 				last_baro_time_us = _baro_sample_delayed.time_us;
 				float raw_offset_error =  (_baro_sample_delayed.hgt - _hgt_sensor_offset) + _state.pos(2) - _baro_hgt_offset;
-				_baro_hgt_offset += dt * math::constrain(0.1f * raw_offset_error, -0.1f, 0.1f);
+				_baro_hgt_offset += local_time_step * math::constrain((0.1f * raw_offset_error), -0.1f, 0.1f);
 			}
 		}