diff --git a/lib/Cake/Utility/Security.php b/lib/Cake/Utility/Security.php
index e6ac1e849..739874c09 100644
--- a/lib/Cake/Utility/Security.php
+++ b/lib/Cake/Utility/Security.php
@@ -192,7 +192,7 @@ class Security {
 			return openssl_random_pseudo_bytes($length);
 		}
 		if (function_exists('mcrypt_create_iv')) {
-			return mcrypt_create_iv($length);
+			return mcrypt_create_iv($length, MCRYPT_DEV_URANDOM);
 		}
 		trigger_error(
 			'You do not have a safe source of random data available. ' .