diff --git a/views/statistics.ejs b/views/statistics.ejs
index 2f8a135..3464dff 100644
--- a/views/statistics.ejs
+++ b/views/statistics.ejs
@@ -15,7 +15,7 @@ let types = {
 <script src="/libs/morris.js/morris.min.js"></script>
 <script>
 function getColorOfScore(score) {
-  let color = [];
+  var color = [];
   color[0] = 'red';
   color[1] = '#ff4b00';
   color[2] = '#ff6200';