diff --git a/.github/workflows/test-python.yml b/.github/workflows/test-python.yml
index 028167128d1e..59ea8be60039 100644
--- a/.github/workflows/test-python.yml
+++ b/.github/workflows/test-python.yml
@@ -85,7 +85,7 @@ jobs:
         if: github.ref_name != 'main' && matrix.python-version == '3.11' && matrix.os == 'ubuntu-latest'
         working-directory: sample_plugin
         run: |
-          . py-polars/.venv/bin/activate
+          . $GITHUB_WORKSPACE/py-polars/.venv/bin/activate
           maturin develop
           pytest