diff --git a/addons/overpressure/CfgEden.hpp b/addons/overpressure/CfgEden.hpp
index 18bcb88aaa4..64a06eadd58 100644
--- a/addons/overpressure/CfgEden.hpp
+++ b/addons/overpressure/CfgEden.hpp
@@ -8,7 +8,7 @@ class Cfg3DEN {
                         tooltip = CSTRING(distanceCoefficient_toolTip);
                         property = QUOTE(overpressureDistanceCoefficient);
                         control = "Edit";
-                        expression = QUOTE(_this setVariable [ARR_3(QQEGVAR(overpressure,distance),_value,true)]);
+                        expression = QUOTE(if (_value >= 0) then { _this setVariable [ARR_3(QQGVAR(distance),_value,true)] });
                         defaultValue = -1;
                         validate = "number";
                         typeName = "NUMBER";