diff --git a/cookbook/configuration/pdo_session_storage.rst b/cookbook/configuration/pdo_session_storage.rst
index 34b67dc207a..a9f4daf54b7 100644
--- a/cookbook/configuration/pdo_session_storage.rst
+++ b/cookbook/configuration/pdo_session_storage.rst
@@ -138,7 +138,7 @@ parameter.ini by referencing the database-related parameters defined there:
     .. code-block:: xml
 
         <service id="pdo" class="PDO">
-            <argument>mysql:dbname=%database_name%</argument>
+            <argument>mysql:host=%database_host%;port=%database_port%;dbname=%database_name%</argument>
             <argument>%database_user%</argument>
             <argument>%database_password%</argument>
         </service>
@@ -146,7 +146,7 @@ parameter.ini by referencing the database-related parameters defined there:
     .. code-block:: php
 
         $pdoDefinition = new Definition('PDO', array(
-            'mysql:dbname=%database_name%',
+            'mysql:host=%database_host%;port=%database_port%;dbname=%database_name%',
             '%database_user%',
             '%database_password%',
         ));