diff --git a/DependencyInjection/PropelExtension.php b/DependencyInjection/PropelExtension.php
index bfdc4e5..0cb3c10 100644
--- a/DependencyInjection/PropelExtension.php
+++ b/DependencyInjection/PropelExtension.php
@@ -106,6 +106,7 @@ class PropelExtension extends Extension
             $c['datasources'][$name]['connection']['settings']['charset'] = array('value' => $container->getParameter('propel.charset'));
         }
 
+        $c['datasources']['default'] = $connectionName;
         $container->getDefinition('propel.configuration')->setArguments(array($c));
     }