diff --git a/containers/jug/dev.Dockerfile b/containers/jug/dev.Dockerfile
index ddb79919e294045cb38e4cfa73e34b611daa2404..bc823553521587b5a51f2d3b28b4e346bb3ab8c4 100644
--- a/containers/jug/dev.Dockerfile
+++ b/containers/jug/dev.Dockerfile
@@ -211,6 +211,7 @@ set -e
 make --jobs ${jobs} --keep-going --directory /opt/spack-environment \
   SPACK_ENV=${SPACK_ENV} SPACK_INSTALL_FLAGS="--use-buildcache only"
 spack gc --yes-to-all
+spack find --long --no-groups
 spack find --long --no-groups \
 | sed -e '1,/Installed packages/d;s/\([^@]*\).*/\1/g' \
 | uniq -D -f1 | grep -v -w -e "\(epic\|py-pip\|py-cython\)" \