diff --git a/Configuration/Filesystem/FilesystemConfigurationSourceFactory.php b/Configuration/Filesystem/FilesystemConfigurationSourceFactory.php
index <HASH>..<HASH> 100644
--- a/Configuration/Filesystem/FilesystemConfigurationSourceFactory.php
+++ b/Configuration/Filesystem/FilesystemConfigurationSourceFactory.php
@@ -33,7 +33,7 @@ final class FilesystemConfigurationSourceFactory implements ConfigurationSourceF
                     ->scalarNode('filename')->defaultValue('composer.json')->cannotBeEmpty()->end()
                     ->integerNode('scan_depth')->info('Restrict depth to scan for configuration file inside theme folder')->defaultNull()->end()
                     ->arrayNode('directories')
-                        ->defaultValue(['%kernel.project_dir%/themes'])
+                        ->defaultValue(['%kernel.project_dir%/app/themes'])
                         ->requiresAtLeastOneElement()
                         ->performNoDeepMerging()
                         ->prototype('scalar')
Reverting to the previous value because this is a BC break