diff --git a/.github/workflows/python.yml b/.github/workflows/python.yml
index 1184a97..dc13369 100644
--- a/.github/workflows/python.yml
+++ b/.github/workflows/python.yml
@@ -23,7 +23,7 @@ jobs:
     steps:
       - uses: actions/checkout@master
         with:
-        ref: ${{ github.event.pull_request.head.sha }}
+          ref: ${{ github.event.pull_request.head.sha }}
       - name: 'Run PEP8 check'
         uses: quentinguidee/pep8-action@v1
         with: