diff --git a/docs/conf.py b/docs/conf.py
index ce9b974e2..c5c0f747a 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -9,7 +9,7 @@
 import os
 import sys
 import locale
-locale.setlocale(locale.LC_ALL, 'en_US.UTF8')
+locale.setlocale(locale.LC_ALL, 'en_US.UTF-8')
 from calendar import month_name
 from datetime import date