diff --git a/.github/workflows/create-spack-mirror.yaml b/.github/workflows/create-spack-mirror.yaml
index 7492420d3..762965062 100644
--- a/.github/workflows/create-spack-mirror.yaml
+++ b/.github/workflows/create-spack-mirror.yaml
@@ -27,11 +27,11 @@ jobs:
         run: |
           source ./setup.sh
           ./create-env.py --app ${{ github.event.inputs.app }}  --site ${{ github.event.inputs.site }}  --name all
-          spack env activate -d envs/all
+          spack env activate envs/all
           spack compiler find
-          spack add re2c
-          spack add clingo
-          spack concretize
+          #spack add re2c
+          #spack add clingo
+          spack --show-cores=full concretize --reuse
           spack mirror create -a
           # upload-artifact does not allow filenames that begin with '?'
           rm -f cache/source_cache/autoconf/\?id=05972f49ee632cd98057a3caf82ebfb9574846da-eaa3f69