diff --git a/shiftcounter.php b/shiftcounter.php
index fc85718..7d179d0 100644
--- a/shiftcounter.php
+++ b/shiftcounter.php
@@ -31,7 +31,7 @@ for($i = 0; $i < 2; $i++) {
     }
 }
 
-usort($worklists, function($a, $b) {
+uasort($worklists, function($a, $b) {
     if ($a[1] == $b[1]) return;
     return $a[1] > $b[1] ? -1 : 1;
 });