diff --git a/doc/conf.py b/doc/conf.py
index cd88758c6a3..8c0287cf84c 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -103,7 +103,7 @@
 htmlhelp_basename = 'CabalUsersGuide'
 
 # MathJax to use HTML rendering by default (makes the text selectableable, see #8453)
-mathjax_path = 'https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js'
+mathjax_path = 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/latest.js?config=TeX-AMS_CHTML'
 
 
 # -- Options for LaTeX output ---------------------------------------------