diff --git a/.github/workflows/issue_lock.yml b/.github/workflows/issue_lock.yml
index 3f6dcffe..db72729b 100644
--- a/.github/workflows/issue_lock.yml
+++ b/.github/workflows/issue_lock.yml
@@ -29,7 +29,7 @@ jobs:
                 continue;
               }
 
-              if ((now - new Date(issue.updated_at)) < 1000*60*60*24*31*6) {
+              if ((now - new Date(issue.closed_at)) < 1000*60*60*24*31*6) {
                 continue;
               }