diff --git a/static/js/libs/katex.js b/static/js/libs/katex.js
index bb220db..6cf3147 100644
--- a/static/js/libs/katex.js
+++ b/static/js/libs/katex.js
@@ -17,7 +17,7 @@ window.addEventListener("load", () => {
   }
 
   const attribute = "data-math-style";
-  for (let element of document.querySelectorAll(`span[${attribute}]`)) {
+  for (const element of document.querySelectorAll(`span[${attribute}]`)) {
     katex.render(element.textContent, element, {
       throwOnError: false,
       displayMode: element.getAttribute(attribute) === "display",