diff --git a/docker/utils/pyutils.sh b/docker/utils/pyutils.sh
--- a/docker/utils/pyutils.sh
+++ b/docker/utils/pyutils.sh
@@ -5,7 +5,9 @@
 
   if [[ -d /src ]] ; then
     for srcrepo in /src/swh-* ; do
-      pip install $srcrepo
+      tmpdir=`mktemp -d`
+      pip install -b $tmpdir $srcrepo
+      rm -rf $tmpdir
     done
   fi