diff --git a/reana_server/config.py b/reana_server/config.py
index 2877f030..b74b57f7 100644
--- a/reana_server/config.py
+++ b/reana_server/config.py
@@ -14,6 +14,7 @@
 
 from invenio_app.config import APP_DEFAULT_SECURE_HEADERS
 from invenio_oauthclient.contrib import cern
+
 # Database
 # ========
 #: Database URI including user and password