diff --git a/lib/Relation/HasMany.php b/lib/Relation/HasMany.php
index 0366b15..14232b1 100644
--- a/lib/Relation/HasMany.php
+++ b/lib/Relation/HasMany.php
@@ -122,7 +122,7 @@ public function save(EntityInterface $entity, $relationName, $options = [])
         if (count($deletedIds) || $relatedEntities === false) {
             $conditions = [$this->foreignKey() => $entity->primaryKey()];
             if (count($deletedIds)) {
-                $conditions[$this->localKey().' :in'] = $deletedIds;
+                $conditions[$relatedMapper->primaryKeyField().' :in'] = $deletedIds;
             }
             if ($relatedMapper->entityManager()->fields()[$this->foreignKey()]['notnull']) {
                 $relatedMapper->delete($conditions);