diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 516fdf9f..04d4c6d2 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -20,9 +20,18 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
+        with:
+          # Make sure the actual branch is checked out when running on pull requests
+          ref: ${{ github.event.pull_request.base.ref }}
+
+          # This is important to fetch the changes to the previous commit
+          fetch-depth: 0
 
       - name: Prettify code
         uses: creyD/prettier_action@v4.0
+        with:
+          prettier_options: "src/**/*.{ts,jsx,js,css,html,json,md}" --write
+          only_changed: True
   build:
     # The type of runner that the job will run on
     if: github.event_name != 'pull_request'