diff --git a/mayan/apps/converter/views.py b/mayan/apps/converter/views.py
index c60a56b593..02bfd4ad1f 100644
--- a/mayan/apps/converter/views.py
+++ b/mayan/apps/converter/views.py
@@ -5,6 +5,7 @@ import logging
 from django.contrib.contenttypes.models import ContentType
 from django.core.exceptions import PermissionDenied
 from django.core.urlresolvers import reverse
+from django.http import Http404
 from django.shortcuts import get_object_or_404
 from django.utils.translation import ugettext_lazy as _