diff --git a/src/stale.php b/src/stale.php
index 6551033..1588641 100755
--- a/src/stale.php
+++ b/src/stale.php
@@ -23,7 +23,7 @@ if (!$keepLabel = $repo->getLabelByName('keep')) {
 }
 
 //define the function to process each issue
-$callback = function($issue) use ($staleLabel) {
+$callback = function($issue) use ($staleLabel, $keepLabel) {
     $updatedTime=strtotime($issue->updated_at);
     $updateDaysAgo=(time()-$updatedTime)/60/60/24;
     echo "#{$issue->number} - $updateDaysAgo days ago - {$issue->title}\n";