diff --git a/doc/conf.py b/doc/conf.py
index 3be8bf76101f2111e0b0996a050c467b11b11e8b..15e965ae566dbfd23d62d278e82585fb6fc5540d 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -112,7 +112,6 @@ else:
     # documentation.
     html_theme_options = {
             "navbar_fixed_top": "true",
-            "navbar_class": "navbar navbar-inverse",
             "navbar_site_name": "Contents",
             'bootstrap_version': '3',
             'source_link_position': 'footer',