diff --git a/apachesolr_multilingual.module b/apachesolr_multilingual.module
index eba0b5b..18188c3 100644
--- a/apachesolr_multilingual.module
+++ b/apachesolr_multilingual.module
@@ -173,6 +173,9 @@ function apachesolr_multilingual_apachesolr_index_documents_alter(&$documents, $
                 }
 
                 $additional_documents[$id]->id = $id;
+                // Add document_id of original language, so that all translations can be deleted together, when original document is removed.
+                // See apachesolr_index_delete_entity_from_index()
+                $additional_documents[$id]->sm_parent_document_id = $document->id;
 
                 apachesolr_index_node_solr_document($additional_documents[$id], $entity, $entity_type, $env_id);