diff --git a/.github/workflows/preview.yml b/.github/workflows/preview.yml
index cb834b9..d7d601e 100644
--- a/.github/workflows/preview.yml
+++ b/.github/workflows/preview.yml
@@ -2,7 +2,7 @@
 # https://github.com/firebase/firebase-tools
 
 name: Deploy to Firebase for PR Testing
-'on': pull_request
+on: pull_request
 jobs:
   build_and_preview:
     if: '${{ github.event.pull_request.head.repo.full_name == github.repository }}'