--- diffoscope/locale.py	2017-05-09 17:44:54.000000000 +0200
+++ diffoscope/locale.py	2017-05-09 17:45:08.000000000 +0200
@@ -52,6 +52,6 @@
         os.environ[x] = 'C'
 
     os.environ['TZ'] = 'UTC'
-    os.environ['LC_CTYPE'] = 'C.UTF-8'
+    os.environ['LC_CTYPE'] = 'UTF-8'
 
     time.tzset()