diff --git a/swh/docs/sphinx/view_in_gitlab.py b/swh/docs/sphinx/view_in_gitlab.py
index e2c1269306a844158441fbe23c3fa2222244c83f..8d4bdb13b565f6907bbaf4d5ea2caaaaadf07c8f 100644
--- a/swh/docs/sphinx/view_in_gitlab.py
+++ b/swh/docs/sphinx/view_in_gitlab.py
@@ -32,3 +32,4 @@ def html_page_context(app, pagename, templatename, context, doctree):
 
 def setup(app):
     app.connect("html-page-context", html_page_context)
+    return {"parallel_read_safe": True}