diff --git a/.github/workflows/regressiontest_container.yml b/.github/workflows/regressiontest_container.yml
index ba1b8f157..2f0ce9072 100644
--- a/.github/workflows/regressiontest_container.yml
+++ b/.github/workflows/regressiontest_container.yml
@@ -19,6 +19,7 @@ jobs:
         run: | 
           set +xe
           . /etc/profile
+          which csh zsh
           module load python
           python3 -m venv env
           source env/bin/activate