diff --git a/tabellio/searchform/form.py b/tabellio/searchform/form.py
index 8179c65..fb199b1 100644
--- a/tabellio/searchform/form.py
+++ b/tabellio/searchform/form.py
@@ -773,8 +773,12 @@ class SearchView(BrowserView):
             return []
 
         if data.get('text'):
-            # plaintext search, get document ids from postgresql
-            kw['id'] = self.get_ids_from_postgres(data.get('text'))
+            portal = getToolByName(self.context, 'portal_url').getPortalObject()
+            if hasattr(portal, 'db'):
+                # plaintext search, get document ids from postgresql
+                kw['id'] = self.get_ids_from_postgres(data.get('text'))
+            else:
+                kw['SearchableText'] = data.get('text')
 
         if data.get('search_type_is_document'):
             kw['portal_type'] = 'tabellio.documents.document'