diff --git a/unittests/test_authentication_external.py b/unittests/test_authentication_external.py
index 1a6075c5c819ceaeae3c90b6079d7f97996ab188..a8fc6f79578c9812dab52dd1fa3807f62fd710fb 100644
--- a/unittests/test_authentication_external.py
+++ b/unittests/test_authentication_external.py
@@ -1,3 +1,4 @@
+#! -*- coding: utf-8 -*-
 #
 # ** header v3.0
 # This file is a part of the CaosDB Project.