diff -u b/title.module b/title.module
--- b/title.module
+++ b/title.module
@@ -479,7 +479,7 @@
     // Find out the actual language to use (field might be untranslatable).
     $langcode = field_language($entity_type, $entity, $info['field']['field_name'], $langcode);
     // Also remember the language we sync here.
-    $entity->{$legacy_field . '_sync_source_lang'} = $langcode;
+    $entity->{$legacy_field . '_sync_source_lang'} = $entity->language;
     $values = $info['callbacks']['sync_get']($entity_type, $entity, $legacy_field, $info, $langcode);
     foreach ($values as $name => $value) {
       if ($value !== NULL) {