diff --git a/src/Symfony/Bridge/Doctrine/DependencyInjection/AbstractDoctrineExtension.php b/src/Symfony/Bridge/Doctrine/DependencyInjection/AbstractDoctrineExtension.php
index 1518361c79..7da6d9fbcb 100644
--- a/src/Symfony/Bridge/Doctrine/DependencyInjection/AbstractDoctrineExtension.php
+++ b/src/Symfony/Bridge/Doctrine/DependencyInjection/AbstractDoctrineExtension.php
@@ -252,7 +252,7 @@ abstract class AbstractDoctrineExtension extends Extension
             throw new \InvalidArgumentException(sprintf('Can only configure "xml", "yml", "annotation", "php" or '.
                 '"staticphp" through the DoctrineBundle. Use your own bundle to configure other metadata drivers. '.
                 'You can register them by adding a new driver to the '.
-                '"%s" service definition.', $this->getObjectManagerElementName($objectManagerName.'.metadata_driver')
+                '"%s" service definition.', $this->getObjectManagerElementName($objectManagerName.'_metadata_driver')
             ));
         }
     }