diff --git a/lib/main.js b/lib/main.js
index 671258e8..a2dea0b1 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -76,7 +76,7 @@ function isLabeledStale(issue, label) {
     return issue.labels.filter(labelComparer).length > 0;
 }
 function wasLastUpdatedBefore(issue, num_days) {
-    const daysInMillis = 1000 * 60 * 60 * num_days;
+    const daysInMillis = 1000 * 60 * 60 * 24 * num_days;
     const millisSinceLastUpdated = new Date().getTime() - new Date(issue.updated_at).getTime();
     return millisSinceLastUpdated >= daysInMillis;
 }