diff --git a/src/index.ts b/src/index.ts
index 3493bd51..7d25013d 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -59,7 +59,7 @@ async function main() {
 
       let cancel_before;
       if (all_but_latest) {
-        cancel_before = new Date(data.workflow_runs.reduce((a, b) => a.created_at < b.created_at ? a.created_at : b.created_at));
+        cancel_before = new Date(data.workflow_runs.reduce((a, b) => Math.min(a.created_at, b.created_at);
       } else {
         cancel_before = new Date(current_run.created_at);
       }