diff --git a/hudson_win_package_release.bat b/hudson_win_package_release.bat
index cf926cb..30d5f91 100644
--- a/hudson_win_package_release.bat
+++ b/hudson_win_package_release.bat
@@ -32,7 +32,7 @@ ECHO #define OTSoNumber "%OT_SO_NUMBER%" >> InstallConfig.iss
 set DATA_FILE=FlightGear-%FLIGHTGEAR_VERSION%-data
 
 REM extract the data files
-7z e -aoa %DATA_FILE%.tar.bz && 7z x -aoa %DATA_FILE%.tar
+7z e -aoa %DATA_FILE%.tar.bz2 && 7z x -aoa %DATA_FILE%.tar
 
 REM run Inno-setup!
 REM use iscc instead of compil32 for better error reporting