diff --git a/src/Doctrine/EntityDetails.php b/src/Doctrine/EntityDetails.php
index aa3550115..278235364 100644
--- a/src/Doctrine/EntityDetails.php
+++ b/src/Doctrine/EntityDetails.php
@@ -63,7 +63,7 @@ public function getFormFields()
         }
 
         foreach ($this->metadata->associationMappings as $fieldName => $relation) {
-            if (ClassMetadata::ONE_TO_MANY !== $relation['type']) {
+            if (\Doctrine\ORM\Mapping\ClassMetadata::ONE_TO_MANY !== $relation['type']) {
                 $fields[] = $fieldName;
             }
         }