diff --git a/hudson_build_release.sh b/hudson_build_release.sh
index 97ef1f6..5f8edd4 100755
--- a/hudson_build_release.sh
+++ b/hudson_build_release.sh
@@ -64,5 +64,5 @@ echo "Syncing base packages files from sphere.telascience.org"
 rsync -avz --filter 'merge base-package.rules' \
  -e ssh jturner@sphere.telascience.org:/home/jturner/fgdata .
 
-tar cjf output/FlightGear-$VERSION-data.tar.bz fgdata/
+tar cjf output/FlightGear-$VERSION-data.tar.bz2 fgdata/