diff --git a/tests/flexmock_test.py b/tests/flexmock_test.py
index 19e81e6..08585ac 100644
--- a/tests/flexmock_test.py
+++ b/tests/flexmock_test.py
@@ -1,4 +1,4 @@
-# -*- coding: utf8 -*-
+# -*- coding: utf-8 -*-
 from flexmock import EXACTLY
 from flexmock import AT_LEAST
 from flexmock import AT_MOST