diff --git a/.github/workflows/preview_comment.yml b/.github/workflows/preview_comment.yml
index 330ff8836..1e329c527 100644
--- a/.github/workflows/preview_comment.yml
+++ b/.github/workflows/preview_comment.yml
@@ -2,7 +2,8 @@ name: Comment preview environment URL
 
 on:
   pull_request:
-    types: [opened]
+    types:
+      - opened
 
 jobs:
   comment: