diff --git a/.github/workflows/netlify-pr.yaml b/.github/workflows/netlify-pr.yaml
index e1ba2ef..f1d4dce 100644
--- a/.github/workflows/netlify-pr.yaml
+++ b/.github/workflows/netlify-pr.yaml
@@ -46,7 +46,9 @@ jobs:
         run: curl -s https://raw.githubusercontent.com/vector-im/element-call/main/config/netlify_redirects > webapp/_redirects
 
       - name: Add config file
-        run: curl -s https://raw.githubusercontent.com/vector-im/element-call/${{ github.event.workflow_run.head_branch }}/config/element_io_preview.json > webapp/config.json
+        env:
+          HEADBRACH: ${{ github.event.workflow_run.head_branch }}
+        run: curl -s "https://raw.githubusercontent.com/vector-im/element-call/${HEADBRACH}/config/element_io_preview.json" > webapp/config.json
 
       - name: ☁️ Deploy to Netlify
         id: netlify