diff --git a/src/Jenssegers/Mongodb/Connection.php b/src/Jenssegers/Mongodb/Connection.php
index 733d2bbdf..3c98ec677 100644
--- a/src/Jenssegers/Mongodb/Connection.php
+++ b/src/Jenssegers/Mongodb/Connection.php
@@ -111,20 +111,22 @@ protected function getDsn(array $config)
         // Treat host option as array of hosts
         $hosts = is_array($config['host']) ? $config['host'] : array($config['host']);
 
-        foreach ($hosts as &$host)
+        $credentials = null;
+
+        if (isset($config['username']) and isset($config['password']))
         {
-            if (isset($config['username']) and isset($config['password']))
-            {
-                $host = "{$username}:{$password}@{$host}";
-            }
+            $credentials = "{$username}:{$password}@";
+        }
 
+        foreach ($hosts as &$host)
+        {
             if (isset($config['port']))
             {
                 $host = "{$host}:{$port}";
             }
         }
 
-        return "mongodb://" . implode(',', $hosts) . "/{$database}";
+        return "mongodb://" . $credentials . implode(',', $hosts) . "/{$database}";
     }
 
     /**