diff --git a/_includes/mathjax.html b/_includes/mathjax.html
index 987ea09..9f5b6af 100644
--- a/_includes/mathjax.html
+++ b/_includes/mathjax.html
@@ -2,3 +2,5 @@
   type="text/javascript" id="MathJax-script" async
   src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-svg.js">
 </script>
+<script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script>
+<script id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>