diff --git a/openstack_auth/forms.py b/openstack_auth/forms.py
index 2c8092c..8c1fcee 100644
--- a/openstack_auth/forms.py
+++ b/openstack_auth/forms.py
@@ -98,7 +98,6 @@ def clean(self):
             msg = 'Login failed for user "%(username)s".' % \
                 {'username': username}
             LOG.warning(msg)
-            self.request.session.flush()
             raise forms.ValidationError(exc)
         if hasattr(self, 'check_for_test_cookie'):  # Dropped in django 1.7
             self.check_for_test_cookie()