diff --git a/admin-tools/setup-python-3.3.sh b/admin-tools/setup-python-3.3.sh
index 821ca59a..e51fc7f3 100755
--- a/admin-tools/setup-python-3.3.sh
+++ b/admin-tools/setup-python-3.3.sh
@@ -27,6 +27,7 @@ trap finish EXIT
 
 export PATH=$HOME/.pyenv/bin/pyenv:$PATH
 
+mydir=$(dirname $bs)
 fulldir=$(readlink -f $mydir)
 cd $fulldir/..
 (cd $fulldir/.. && checkout_version python-spark master && checkout_version python-xdis &&