diff --git a/examples/browser/pretty_printing_with_mathjax.html b/examples/browser/pretty_printing_with_mathjax.html
index 1fa273286..d639b07d4 100644
--- a/examples/browser/pretty_printing_with_mathjax.html
+++ b/examples/browser/pretty_printing_with_mathjax.html
@@ -5,7 +5,6 @@
   <title>math.js | pretty printing with MathJax</title>
 
   <script src="../../lib/browser/math.js"></script>
-  <script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script>
   <script src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-svg.js"></script>
 
   <style>