diff --git a/symposion/proposals/actions.py b/symposion/proposals/actions.py
index 3dcfb1681da164932de83b32a994b868955d759e..d059da81929bcc944ab765003efd81753b57e7e3 100644
--- a/symposion/proposals/actions.py
+++ b/symposion/proposals/actions.py
@@ -22,9 +22,8 @@ def export_as_csv_action(description="Export selected objects as CSV file",
         elif exclude:
             excludeset = set(exclude)
             field_names = field_names - excludeset
-        response = HttpResponse(mimetype="text/csv")
-        response["Content-Disposition"] = \
-            "attachment; filename=%s.csv" % unicode(opts).replace(".", "_")
+        response = HttpResponse(content_type="text/csv")
+        response["Content-Disposition"] = "attachment; filename=%s.csv" % unicode(opts).replace(".", "_")
         writer = csv.writer(response)
         if header:
             writer.writerow(list(field_names))