diff --git a/modules/translation/translation.module b/modules/translation/translation.module
index 04401aed188196cbc080610f02bb1c6b4c965a01..6a8c731517f4cbcf979339cf52c99b938ea748d4 100644
--- a/modules/translation/translation.module
+++ b/modules/translation/translation.module
@@ -199,7 +199,7 @@ function translation_nodeapi_prepare(&$node, $teaser, $page) {
       $node->title = $node->translation_source->title;
       $node->body = $node->translation_source->body;
       // Let every module add custom translated fields.
-      node_invoke_nodeapi($node, 'prepare translation');
+      node_invoke_nodeapi($node, 'prepare_translation');
     }
   }
 }