diff --git a/pdoc/templates/math.html.jinja2 b/pdoc/templates/math.html.jinja2
index 1df6d90b..07f8d348 100644
--- a/pdoc/templates/math.html.jinja2
+++ b/pdoc/templates/math.html.jinja2
@@ -10,7 +10,6 @@
         }
     };
 </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>
 <script>
     /* Re-invoke MathJax when DOM content changes, for example during search. */
diff --git a/test/testdata/math_demo.html b/test/testdata/math_demo.html
index 4c2b0250..6e90848f 100644
--- a/test/testdata/math_demo.html
+++ b/test/testdata/math_demo.html
@@ -18,7 +18,6 @@
         }
     };
 </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>
 <script>
     /* Re-invoke MathJax when DOM content changes, for example during search. */
diff --git a/test/testdata/math_misc.html b/test/testdata/math_misc.html
index d5db808e..443539b5 100644
--- a/test/testdata/math_misc.html
+++ b/test/testdata/math_misc.html
@@ -18,7 +18,6 @@
         }
     };
 </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>
 <script>
     /* Re-invoke MathJax when DOM content changes, for example during search. */