diff --git a/addons/rangecard/functions/fnc_updateRangeCard.sqf b/addons/rangecard/functions/fnc_updateRangeCard.sqf
index 35a7552ef8..9f828157bf 100644
--- a/addons/rangecard/functions/fnc_updateRangeCard.sqf
+++ b/addons/rangecard/functions/fnc_updateRangeCard.sqf
@@ -114,7 +114,7 @@ _zeroRange  = 100;
 
 _barometricPressure = 1013.25;
 if (missionNamespace getVariable [QEGVAR(advanced_ballistics,enabled), false]) then {
-    _barometricPressure = EGVAR(weather,altitude) call EFUNC(weather,calculateBarometricPressure);
+    _barometricPressure = 1013.25 * (1 - (0.0065 * EGVAR(weather,altitude)) / 288.15) ^ 5.255754495;
 };
 _relativeHumidity = 0.5;