diff --git a/test/test_isl.py b/test/test_isl.py
index 145172e76dd47da9eab0e5554223e4a29576620b..18fa610ba7b96f7ac08291a33581dd6270098510 100644
--- a/test/test_isl.py
+++ b/test/test_isl.py
@@ -1,3 +1,4 @@
+# encoding: utf-8
 from __future__ import division, print_function
 
 __copyright__ = "Copyright (C) 2011-15 Andreas Kloeckner"