diff --git a/src/Symfony/Bridge/Doctrine/DependencyInjection/AbstractDoctrineExtension.php b/src/Symfony/Bridge/Doctrine/DependencyInjection/AbstractDoctrineExtension.php
index 0dd4e1be36..f67ecd35c9 100644
--- a/src/Symfony/Bridge/Doctrine/DependencyInjection/AbstractDoctrineExtension.php
+++ b/src/Symfony/Bridge/Doctrine/DependencyInjection/AbstractDoctrineExtension.php
@@ -151,7 +151,7 @@ abstract class AbstractDoctrineExtension extends Extension
         }
 
         if (!$bundleConfig['dir']) {
-            if (\in_array($bundleConfig['type'], ['annotation', 'staticphp'])) {
+            if (\in_array($bundleConfig['type'], ['annotation', 'staticphp', 'attribute'])) {
                 $bundleConfig['dir'] = $bundleDir.'/'.$this->getMappingObjectDefaultName();
             } else {
                 $bundleConfig['dir'] = $bundleDir.'/'.$this->getMappingResourceConfigDirectory();
@@ -193,6 +193,10 @@ abstract class AbstractDoctrineExtension extends Extension
                     $args[0] = array_merge(array_values($driverPaths), $args[0]);
                 }
                 $mappingDriverDef->setArguments($args);
+            } elseif ('attribute' === $driverType) {
+                $mappingDriverDef = new Definition($this->getMetadataDriverClass($driverType), [
+                    array_values($driverPaths),
+                ]);
             } elseif ('annotation' == $driverType) {
                 $mappingDriverDef = new Definition($this->getMetadataDriverClass($driverType), [
                     new Reference($this->getObjectManagerElementName('metadata.annotation_reader')),
@@ -236,8 +240,8 @@ abstract class AbstractDoctrineExtension extends Extension
             throw new \InvalidArgumentException(sprintf('Specified non-existing directory "%s" as Doctrine mapping source.', $mappingConfig['dir']));
         }
 
-        if (!\in_array($mappingConfig['type'], ['xml', 'yml', 'annotation', 'php', 'staticphp'])) {
-            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')));
+        if (!\in_array($mappingConfig['type'], ['xml', 'yml', 'annotation', 'php', 'staticphp', 'attribute'])) {
+            throw new \InvalidArgumentException(sprintf('Can only configure "xml", "yml", "annotation", "php", "staticphp" or "attribute" 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')));
         }
     }
 
@@ -437,7 +441,7 @@ abstract class AbstractDoctrineExtension extends Extension
     {
         @trigger_error(sprintf('Not declaring the "%s" method in class "%s" is deprecated since Symfony 4.4. This method will be abstract in Symfony 5.0.', __METHOD__, static::class), \E_USER_DEPRECATED);
 
-        return '%'.$this->getObjectManagerElementName('metadata.'.$driverType.'.class%');
+        return '%'.$this->getObjectManagerElementName('metadata.'.$driverType.'.class').'%';
     }
 
     /**