diff --git a/scripts/tools/version.bat b/scripts/tools/version.bat
index 433192b90..153a6734d 100644
--- a/scripts/tools/version.bat
+++ b/scripts/tools/version.bat
@@ -9,8 +9,8 @@ SET HUDSON_BUILD_NUMBER=0
 SET HUDSON_BUILD_ID=none
 SET REVISION=none
 
-IF DEFINED %BUILD_ID% SET HUDSON_BUILD_ID=%BUILD_ID%
-IF DEFINED %BUILD_NUMBER% SET HUDSON_BUILD_NUMBER=%BUILD_NUMBER%
+IF DEFINED BUILD_ID SET HUDSON_BUILD_ID=%BUILD_ID%
+IF DEFINED BUILD_NUMBER SET HUDSON_BUILD_NUMBER=%BUILD_NUMBER%
 
 SET Header=src\Include\version.h