diff --git a/src/collective/task/browser/cancel_attribution.py b/src/collective/task/browser/cancel_attribution.py
index 016ca1a..5b9b7f2 100644
--- a/src/collective/task/browser/cancel_attribution.py
+++ b/src/collective/task/browser/cancel_attribution.py
@@ -93,6 +93,7 @@ class CancelTaskAttribution(z3c.form.form.Form):
                 else:
                     # delete local roles for user
                     document.manage_delLocalRoles([responsible])
+                document.reindexObjectSecurity()
 
                 # remove relevant subtask
                 self.context.manage_delObjects(subtask.id)
diff --git a/src/collective/task/browser/cancel_information.py b/src/collective/task/browser/cancel_information.py
index b5db9c5..5e78cdc 100644
--- a/src/collective/task/browser/cancel_information.py
+++ b/src/collective/task/browser/cancel_information.py
@@ -80,6 +80,7 @@ class CancelInformation(z3c.form.form.Form):
                 else:
                     # delete local roles for user
                     self.context.manage_delLocalRoles([responsible_id])
+                self.context.reindexObjectSecurity()
 
                 email_notification_of_canceled_information(information)