diff --git a/pythonpath.sh b/pythonpath.sh
index 63857f6..a123409 100644
--- a/pythonpath.sh
+++ b/pythonpath.sh
@@ -1,24 +1,24 @@
 # usage: . pythonpath
 #
 # source this file as above (do not execute it) to set the PYTHONPATH
 # environment variable to the list of directories corresponding to the
 # repositories known to mr
 
 base_path=$( dirname "$0" )
 
 tmp_path=$(
-for dir in $( cd $base_path && bin/ls-all-repos --absolute ) ; do
+for dir in $( builtin cd $base_path && bin/ls-all-repos --absolute ) ; do
     if echo "$dir" | grep -q -- '-template$' ; then
         continue
     fi
     if test -d "${dir}/swh/" ; then
         echo "$dir"
     fi
 done \
     | paste -d':' -s)
 
 export PYTHONPATH="$tmp_path"
 
 if [ "$1" = "-p" -o "$1" = "--print" ] ; then
     echo $PYTHONPATH
 fi