diff --git a/cookbook/configuration/pdo_session_storage.rst b/cookbook/configuration/pdo_session_storage.rst
index b4123b275f5..34b67dc207a 100644
--- a/cookbook/configuration/pdo_session_storage.rst
+++ b/cookbook/configuration/pdo_session_storage.rst
@@ -131,7 +131,7 @@ parameter.ini by referencing the database-related parameters defined there:
         pdo:
             class: PDO
             arguments:
-                - "mysql:dbname=%database_name%"
+                - "mysql:host=%database_host%;port=%database_port%;dbname=%database_name%"
                 - %database_user%
                 - %database_password%