diff --git a/phpseclib/Math/BigInteger.php b/phpseclib/Math/BigInteger.php
index f32831d9..b149d6e5 100644
--- a/phpseclib/Math/BigInteger.php
+++ b/phpseclib/Math/BigInteger.php
@@ -3066,8 +3066,7 @@ class Math_BigInteger
      */
     function _random_number_helper($size)
     {
-        $crypt_random = function_exists('crypt_random_string') || (!class_exists('Crypt_Random') && function_exists('crypt_random_string'));
-        if ($crypt_random) {
+        if (function_exists('crypt_random_string')) {
             $random = crypt_random_string($size);
         } else {
             $random = '';