diff --git a/_includes/head_custom.html b/_includes/head_custom.html
index 1a18be03bbe..f04c42e3219 100755
--- a/_includes/head_custom.html
+++ b/_includes/head_custom.html
@@ -3,7 +3,6 @@
 {% endif %}
 
 {% if page.has_math == true %}
-  <script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script>
   <script id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3.0.1/es5/tex-mml-chtml.js"></script>
 {% endif %}