diff --git a/src/Mapping/Driver/AbstractAnnotationDriver.php b/src/Mapping/Driver/AbstractAnnotationDriver.php
index 43c92deae3..1eca100b1a 100644
--- a/src/Mapping/Driver/AbstractAnnotationDriver.php
+++ b/src/Mapping/Driver/AbstractAnnotationDriver.php
@@ -11,6 +11,7 @@
 
 use Doctrine\Common\Annotations\Reader;
 use Doctrine\Deprecations\Deprecation;
+use Doctrine\ORM\Mapping\FieldMapping;
 use Doctrine\Persistence\Mapping\ClassMetadata;
 use Doctrine\Persistence\Mapping\Driver\MappingDriver;
 
@@ -131,7 +132,9 @@ protected function isValidField($meta, $field)
     {
         $mapping = $meta->getFieldMapping($field);
 
-        return $mapping && in_array($mapping['type'], $this->validTypes, true);
+        $type = $mapping instanceof FieldMapping ? $mapping->type : $mapping['type'];
+
+        return in_array($type, $this->validTypes, true);
     }
 
     /**