diff --git a/build-ubunturepo b/build-ubunturepo
index dc0d34d65..3678dc71e 100755
--- a/build-ubunturepo
+++ b/build-ubunturepo
@@ -484,7 +484,7 @@ __EOF__
     chmod -R g+w xcat-dep
 
     #create the tar ball
-    dep_tar_name=xcat-dep-ubuntu-`date +%Y%m%d%H%M`.tar.bz
+    dep_tar_name=xcat-dep-ubuntu-`date +%Y%m%d%H%M`.tar.bz2
     tar -hjcf $dep_tar_name xcat-dep
     chgrp root $dep_tar_name
     chmod g+w $dep_tar_name