diff --git a/.github/workflows/preview.yml b/.github/workflows/preview.yml
index 49f867da9..95d831940 100644
--- a/.github/workflows/preview.yml
+++ b/.github/workflows/preview.yml
@@ -28,6 +28,8 @@ jobs:
         run: |
           npm clean-install
           npm run build
+        env:
+          BASE_URL: /pr-preview/pr-${{ github.event.number }}
 
       - name: Deploy preview
         uses: rossjrw/pr-preview-action@f31d5aa7b364955ea86228b9dcd346dc3f29c408