diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 237159e4e0..426aea0dac 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -89,7 +89,12 @@ jobs:
           apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
           accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
           projectName: jellyfin-web
-          branch: ${{ github.event.pull_request.head.ref || github.ref_name }}
+          branch: |
+            ${{
+              github.event.pull_request.head.repo.full_name == github.repository
+              && (github.event.pull_request.head.ref || github.ref_name)
+              || format('{0}/{1}', github.event.pull_request.head.repo.full_name, github.event.pull_request.head.ref)
+            }}
           directory: dist
           gitHubToken: ${{ secrets.GITHUB_TOKEN }}