diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 00c4f5d6..16705d8e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,7 +5,7 @@ on:
   push:
   schedule:
       # Note: * is a special character in YAML so we have to quote the str.
-      cron: '0 4 * * *'
+      - cron: '0 4 * * *'
         
 jobs:
   check: