diff --git a/docs/conf.py b/docs/conf.py
index 7289c1164..dd7acca7b 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -125,7 +125,7 @@
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = None
+language = 'en'
 
 # For Adding Locale
 locale_dirs = ['locale/']   # path is example but recommended.