diff --git a/src/bundle/Core/DependencyInjection/IbexaCoreExtension.php b/src/bundle/Core/DependencyInjection/IbexaCoreExtension.php
index af250d764f..a5d2735786 100644
--- a/src/bundle/Core/DependencyInjection/IbexaCoreExtension.php
+++ b/src/bundle/Core/DependencyInjection/IbexaCoreExtension.php
@@ -648,7 +648,7 @@ private function prependDoctrineConfiguration(ContainerBuilder $container): void
 
             if (isset($config['repositories'])) {
                 $repositoryConnections[] = array_map(
-                    static function (array $repository): ?string {
+                    static function (array $repository): string {
                         return $repository['storage']['connection']
                             ?? 'default';
                     },