diff --git a/.github/workflows/mutation.yml b/.github/workflows/mutation.yml
index 54762fcc..49315c62 100644
--- a/.github/workflows/mutation.yml
+++ b/.github/workflows/mutation.yml
@@ -82,6 +82,6 @@ jobs:
 
       - name: Run infection.
         run: |
-          vendor/bin/roave-infection-static-analysis-plugin -j2 --ignore-msi-with-no-mutations --only-covered
+          vendor/bin/roave-infection-static-analysis-plugin --threads=2 --ignore-msi-with-no-mutations --only-covered
         env:
           STRYKER_DASHBOARD_API_KEY: ${{ secrets.STRYKER_DASHBOARD_API_KEY }}