diff --git a/conf.py b/conf.py
index bb2af79b8..8f638409d 100644
--- a/conf.py
+++ b/conf.py
@@ -8,7 +8,7 @@ dir_path = os.path.dirname(os.path.realpath(__file__))
 sys.path.insert(0, os.path.abspath(dir_path + '/_ext'))
 now = datetime.datetime.now()
 
-extensions = []
+extensions = ['sphinx_rtd_theme']
 
 # General information about the project.
 copyright = str(now.year) + ' Nextcloud GmbH'