diff --git a/app/scodoc/sco_utils.py b/app/scodoc/sco_utils.py
index fcbfb4a767..58bf97568e 100644
--- a/app/scodoc/sco_utils.py
+++ b/app/scodoc/sco_utils.py
@@ -46,8 +46,7 @@ import time
 import traceback
 import types
 import unicodedata
-import six.moves.urllib.parse, six.moves.urllib.error
-import six.moves.urllib.error, six.moves.urllib.parse
+import urllib
 from xml.etree import ElementTree
 
 from flask import g, current_app
@@ -817,11 +816,14 @@ def confirm_dialog(
     # Attention: la page a pu etre servie en GET avec des parametres
     # si on laisse l'url "action" vide, les parametres restent alors que l'on passe en POST...
     if not dest_url:
-        dest_url = request.base_url
-    # strip remaining parameters from destination url:
-    dest_url = six.moves.urllib.parse.splitquery(dest_url)[0]
+        action = ""
+    else:
+        # strip remaining parameters from destination url:
+        dest_url = urllib.parse.splitquery(dest_url)[0]
+        action = f'action="{dest_url}"'
+
     H = [
-        """<form action="%s" method="post">""" % dest_url,
+        f"""<form {action} method="post">""",
         message,
         """<input type="submit" value="%s"/>""" % OK,
     ]