diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 5a288dc..1362699 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -62,6 +62,10 @@ jobs:
       - name: Install tox
         run: python -m pip install tox
       - name: Run
+        env:
+          # workaround for jaraco/jaraco.xonsh#1
+          TOX_OVERRIDE: testenv.pass_env+=PYTEST_ADDOPTS
+          PYTEST_ADDOPTS: -p no:xonsh
         run: tox
 
   collateral: