diff --git a/themis/libellioimport/migration.py b/themis/libellioimport/migration.py
index abf1cf1..4b6baa0 100644
--- a/themis/libellioimport/migration.py
+++ b/themis/libellioimport/migration.py
@@ -470,7 +470,7 @@ class FixRelatedDocs(BrowserView):
 class UpdateToBlobs(BrowserView):
     def __call__(self):
         catalog = getToolByName(self.context, 'portal_catalog')
-        for brain in catalog.search({'portal_type': ['bqrD', 'bulletintravauxD'}):
+        for brain in catalog.search({'portal_type': ['bqrD', 'bulletintravauxD']}):
             object = brain.getObject()
             for attr in ("fichier", "document_imprime"):
                 try: