diff --git a/.github/workflows/macos-ci-aarch64.yaml b/.github/workflows/macos-ci-aarch64.yaml
index 39a6aed4c..6e111f407 100644
--- a/.github/workflows/macos-ci-aarch64.yaml
+++ b/.github/workflows/macos-ci-aarch64.yaml
@@ -151,9 +151,9 @@ jobs:
 
           # Test environment chaining
           echo "Test environment chaining"
-          spack stack create env --name chaintest --template empty --site macos.default --upstream $(realpath envs/${ENVNAME}/install)
+          spack stack create env --name chaintest --template empty --site macos.default --upstream ${ENVDIR}/install
           # Retain config from upstream so we don't have to rebuild:
-          cp -r $PWD/envs/${ENVNAME}/{site,common} $PWD/envs/chaintest/.
+          cp -r ${ENVDIR}/{site,common} $PWD/envs/chaintest/.
           spack env activate ${PWD}/envs/chaintest
           spack add nccmp@1.9.0.1%apple-clang
           spack concretize | tee envs/chaintest/log.concretize