diff --git a/src/Ratchet/Wamp/WampConnection.php b/src/Ratchet/Wamp/WampConnection.php
index a0bf523..a12b162 100644
--- a/src/Ratchet/Wamp/WampConnection.php
+++ b/src/Ratchet/Wamp/WampConnection.php
@@ -17,7 +17,7 @@ class WampConnection extends AbstractConnectionDecorator {
         parent::__construct($conn);
 
         $this->WAMP            = new \StdClass;
-        $this->WAMP->sessionId = uniqid();
+        $this->WAMP->sessionId = md5(uniqid(mt_rand(), true));
         $this->WAMP->prefixes  = array();
 
         $this->send(json_encode(array(WAMP::MSG_WELCOME, $this->WAMP->sessionId, 1, \Ratchet\VERSION)));
diff --git a/tests/unit/Wamp/TopicTest.php b/tests/unit/Wamp/TopicTest.php
index b8685b7..26db0d3 100644
--- a/tests/unit/Wamp/TopicTest.php
+++ b/tests/unit/Wamp/TopicTest.php
@@ -81,7 +81,7 @@ class TopicTest extends \PHPUnit_Framework_TestCase {
         $topic->add($first);
         $topic->add($second);
         $topic->add($third);
-
+        
         $topic->broadcast($msg, array($second->WAMP->sessionId));
     }