--- a/heuristics/viewHeuristicsDistribution.php
+++ b/heuristics/viewHeuristicsDistribution.php
@@ -12,9 +12,8 @@
 
   include_once("../lib/common.inc.php");
 $query = "select heuristic_name, floor(heuristic_value) as val,count(*) from heuristic_results group by heuristic_name, val";
-$result = mysql_query($query);
-if (!$result) echo mysql_error().$query;
-while ($r = mysql_fetch_array($result, MYSQL_BOTH)) {
+    $result = $conn->query($query);
+foreach ($result->fetchAll() as $r) {
     $series[$r["heuristic_name"]][$r["val"]] = $r[2];
 }