diff --git a/src/DAMA/DoctrineTestBundle/Doctrine/DBAL/StaticDriver.php b/src/DAMA/DoctrineTestBundle/Doctrine/DBAL/StaticDriver.php
index c1efcd5..b0a0976 100644
--- a/src/DAMA/DoctrineTestBundle/Doctrine/DBAL/StaticDriver.php
+++ b/src/DAMA/DoctrineTestBundle/Doctrine/DBAL/StaticDriver.php
@@ -85,7 +85,7 @@ public function getName(): string
     /**
      * {@inheritdoc}
      */
-    public function getDatabase(\Doctrine\DBAL\Connection $conn): string
+    public function getDatabase(\Doctrine\DBAL\Connection $conn): ?string
     {
         return $this->underlyingDriver->getDatabase($conn);
     }