diff --git a/app/Paper/HtmlToPos.php b/app/Paper/HtmlToPos.php
index 9b0392f..4f06534 100644
--- a/app/Paper/HtmlToPos.php
+++ b/app/Paper/HtmlToPos.php
@@ -30,7 +30,7 @@ class HtmlToPos
         preg_match_all($re, $html, $matches, PREG_SET_ORDER, 0);
         foreach ($matches as $match) {
             $pos = strpos($posText, $match[0]);
-            $posText = substr_replace($posText, mb_rand($match[1], $match[2]), $pos, strlen($match[0]));
+            $posText = substr_replace($posText, mt_rand($match[1], $match[2]), $pos, strlen($match[0]));
         }
         return $posText;
     }