--- a/cubicweb/hooks/integrity.py	Fri Apr 05 17:21:14 2019 +0200
+++ b/cubicweb/hooks/integrity.py	Fri Apr 05 17:58:19 2019 +0200
@@ -23,8 +23,6 @@
 
 from threading import Lock
 
-from six import text_type
-
 from cubicweb import validation_error, neg_role
 from cubicweb.schema import (META_RTYPES, WORKFLOW_RTYPES,
                              RQLConstraint, RQLUniqueConstraint)
@@ -276,7 +274,7 @@
                     value = edited[attr]
                 except KeyError:
                     continue # no text to tidy
-                if isinstance(value, text_type): # filter out None and Binary
+                if isinstance(value, str): # filter out None and Binary
                     if getattr(entity, str(metaattr)) == 'text/html':
                         edited[attr] = soup2xhtml(value, self._cw.encoding)