diff --git a/docs/user_guide/i18n.rst b/docs/user_guide/i18n.rst
index a2f1d6bfb..e8cf59f5a 100644
--- a/docs/user_guide/i18n.rst
+++ b/docs/user_guide/i18n.rst
@@ -59,9 +59,9 @@ documentation translations.
       }
 
       def setup(app):
-         locale_dir = os.path.join(os.path.abspath(os.path.dirname(__file__)), "locale")
+          locale_dir = os.path.join(os.path.abspath(os.path.dirname(__file__)), "locale")
 
-         app.add_message_catalog(catalog, locale_dir)
+          app.add_message_catalog(catalog, locale_dir)
 
 #. Extract the strings to localize: