diff --git a/addons/advanced_ballistics/XEH_postInit.sqf b/addons/advanced_ballistics/XEH_postInit.sqf
index 783a5be569..41615696ac 100644
--- a/addons/advanced_ballistics/XEH_postInit.sqf
+++ b/addons/advanced_ballistics/XEH_postInit.sqf
@@ -33,9 +33,10 @@ GVAR(AtmosphericDensitySimulationEnabled) = true;
 GVAR(currentGrid) = 0;
 GVAR(INIT_MESSAGE_ENABLED) = false;
 
-GVAR(extensionAvailable) = "ace_advanced_ballistics" callExtension "version" == "1.0";
+GVAR(extensionVersion) = ("ace_advanced_ballistics" callExtension "version");
+GVAR(extensionAvailable) = (GVAR(extensionVersion) == EXTENSION_REQUIRED_VERSION);
 if (!GVAR(extensionAvailable)) exitWith {
-    if ("ace_advanced_ballistics" callExtension "version" == "") then {
+    if (GVAR(extensionVersion) == "") then {
         diag_log text "[ACE] ERROR: ace_advanced_ballistics.dll is missing";
     } else {
         diag_log text "[ACE] ERROR: ace_advanced_ballistics.dll is incompatible";
diff --git a/addons/advanced_ballistics/script_component.hpp b/addons/advanced_ballistics/script_component.hpp
index 273afa2f49..70c2f47990 100644
--- a/addons/advanced_ballistics/script_component.hpp
+++ b/addons/advanced_ballistics/script_component.hpp
@@ -24,3 +24,5 @@
 #define STD_AIR_DENSITY_ICAO 1.22498
 #define STD_AIR_DENSITY_ASM 1.20885
 #define GET_TEMPERATURE_AT_HEIGHT(h) (EGVAR(weather,currentTemperature) - 0.0065 * (h))
+
+#define EXTENSION_REQUIRED_VERSION "1.0"