diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 4b93000..5746ec8 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -27,6 +27,16 @@ jobs:
     - name: Install pip dependencies
       run: |
         pip install -e '.[dev]'
+    - name: Append LAMMPS paths
+      run: |
+        echo "LAMMPS_POTENTIALS=$GITHUB_WORKSPACE/mcmc/potentials" >> $GITHUB_ENV
+        echo "LAMMPS_POTENTIALS=$LAMMPS_POTENTIALS"
+
+        echo "LAMMPS_COMMAND=$CONDA/vssr-mc/bin/lmp" >> $GITHUB_ENV
+        echo "LAMMPS_COMMAND = $LAMMPS_COMMAND"
+        
+        echo "ASE_LAMMPSRUN_COMMAND=$LAMMPS_COMMAND" >> $GITHUB_ENV
+        echo "ASE_LAMMPSRUN_COMMAND = $ASE_LAMMPSRUN_COMMAND"
     - name: Test with pytest
       run: |
         pytest -rP --cov --cov-report=xml