diff --git a/openstackdocstheme/__init__.py b/openstackdocstheme/__init__.py
index 077c6a9..2d30df7 100644
--- a/openstackdocstheme/__init__.py
+++ b/openstackdocstheme/__init__.py
@@ -113,3 +113,6 @@ def setup(app):
         'openstackdocs',
         os.path.abspath(os.path.dirname(__file__)) + '/theme/openstackdocs',
     )
+    return {
+        'parallel_read_safe': True,
+    }