diff --git a/.github/workflows/run-tests-windows.yml b/.github/workflows/run-tests-windows.yml
index 5ecc8bb..7d72072 100644
--- a/.github/workflows/run-tests-windows.yml
+++ b/.github/workflows/run-tests-windows.yml
@@ -33,6 +33,7 @@ jobs:
     - name: Run tests
       env:
         PYTHONPATH: ${{ github.workspace }}\src
+        PYTHONIOENCODING: utf-8
       run: |
         python -m unittest discover tests