diff --git a/.github/workflows/update-pis.yml b/.github/workflows/update-pis.yml
index 5120e7c..5d484b9 100644
--- a/.github/workflows/update-pis.yml
+++ b/.github/workflows/update-pis.yml
@@ -2,7 +2,7 @@ name: Update raspberry pis
 
 on:
   schedule:
-    - cron: @weekly
+    - cron: '@weekly'
   issue_comment:
 
 jobs: