diff --git a/lib/Doctrine/ORM/Mapping/Driver/AnnotationDriver.php b/lib/Doctrine/ORM/Mapping/Driver/AnnotationDriver.php
index d916bafb3..d59fd3bb7 100644
--- a/lib/Doctrine/ORM/Mapping/Driver/AnnotationDriver.php
+++ b/lib/Doctrine/ORM/Mapping/Driver/AnnotationDriver.php
@@ -472,7 +472,7 @@ class AnnotationDriver extends AbstractAnnotationDriver
 
                 // Check for `fetch`
                 if ($associationOverride->fetch) {
-                    $override['fetch'] = constant(ClassMetadata::class . '::FETCH_' . $associationOverride->fetch);
+                    $override['fetch'] = constant(Mapping\ClassMetadata::class . '::FETCH_' . $associationOverride->fetch);
                 }
 
                 $metadata->setAssociationOverride($fieldName, $override);
diff --git a/lib/Doctrine/ORM/Mapping/Driver/XmlDriver.php b/lib/Doctrine/ORM/Mapping/Driver/XmlDriver.php
index 2ca9190bc..603648ed5 100644
--- a/lib/Doctrine/ORM/Mapping/Driver/XmlDriver.php
+++ b/lib/Doctrine/ORM/Mapping/Driver/XmlDriver.php
@@ -24,6 +24,7 @@ use Doctrine\Common\Persistence\Mapping\Driver\FileDriver;
 use Doctrine\ORM\Mapping\Builder\EntityListenerBuilder;
 use Doctrine\Common\Persistence\Mapping\ClassMetadata;
 use Doctrine\ORM\Mapping\MappingException;
+use Doctrine\ORM\Mapping\ClassMetadata as Metadata;
 
 /**
  * XmlDriver is a metadata driver that enables mapping through XML files.
@@ -623,7 +624,7 @@ class XmlDriver extends FileDriver
 
                 // Check for `fetch`
                 if (isset($overrideElement['fetch'])) {
-                    $override['fetch'] = constant(ClassMetadata::class . '::FETCH_' . (string) $overrideElement['fetch']);
+                    $override['fetch'] = constant(Metadata::class . '::FETCH_' . (string) $overrideElement['fetch']);
                 }
 
                 $metadata->setAssociationOverride($fieldName, $override);
diff --git a/lib/Doctrine/ORM/Mapping/Driver/YamlDriver.php b/lib/Doctrine/ORM/Mapping/Driver/YamlDriver.php
index d65481be4..0908a2878 100644
--- a/lib/Doctrine/ORM/Mapping/Driver/YamlDriver.php
+++ b/lib/Doctrine/ORM/Mapping/Driver/YamlDriver.php
@@ -22,6 +22,7 @@ namespace Doctrine\ORM\Mapping\Driver;
 use Doctrine\Common\Persistence\Mapping\ClassMetadata;
 use Doctrine\ORM\Mapping\Builder\EntityListenerBuilder;
 use Doctrine\Common\Persistence\Mapping\Driver\FileDriver;
+use Doctrine\ORM\Mapping\ClassMetadata as Metadata;
 use Doctrine\ORM\Mapping\MappingException;
 use Symfony\Component\Yaml\Yaml;
 
@@ -624,7 +625,7 @@ class YamlDriver extends FileDriver
 
                 // Check for `fetch`
                 if (isset($associationOverrideElement['fetch'])) {
-                    $override['fetch'] = constant(ClassMetadata::class . '::FETCH_' . $associationOverrideElement['fetch']);
+                    $override['fetch'] = constant(Metadata::class . '::FETCH_' . $associationOverrideElement['fetch']);
                 }
 
                 $metadata->setAssociationOverride($fieldName, $override);