diff --git a/doc/conf.py b/doc/conf.py
index 9c13991783ac83bd4b6cb87787d11bd9711efb56..efb2ce340caba8ebf82c6cbe022efbbf9ed7033b 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -250,5 +250,8 @@ else:
     intersphinx_mapping = link_documentation()
 
 # Adds simplejson, pyzmq links
-intersphinx_mapping["http://simplejson.readthedocs.io/en/stable/"] = None
-intersphinx_mapping["http://pyzmq.readthedocs.io/en/stable/"] = None
+intersphinx_mapping["simplejson"] = (
+    "http://simplejson.readthedocs.io/en/stable/",
+    None,
+)
+intersphinx_mapping["pyzmq"] = ("http://pyzmq.readthedocs.io/en/stable/", None)