diff --git a/lib/Doctrine/ORM/ORMException.php b/lib/Doctrine/ORM/ORMException.php
index fa6fdd30e..89203359c 100644
--- a/lib/Doctrine/ORM/ORMException.php
+++ b/lib/Doctrine/ORM/ORMException.php
@@ -40,7 +40,7 @@ class ORMException extends Exception
         return new self(
             "Entity of type " . get_class($entity) . " has identity through a foreign entity " . get_class($relatedEntity) . ", " .
             "however this entity has no identity itself. You have to call EntityManager#persist() on the related entity " .
-            "and make sure it an identifier was generated before trying to persist '" . get_class($entity) . "'. In case " .
+            "and make sure that an identifier was generated before trying to persist '" . get_class($entity) . "'. In case " .
             "of Post Insert ID Generation (such as MySQL Auto-Increment or PostgreSQL SERIAL) this means you have to call " .
             "EntityManager#flush() between both persist operations."
         );