diff --git a/www/js/app.js b/www/js/app.js
index 9801029b..be9650e9 100644
--- a/www/js/app.js
+++ b/www/js/app.js
@@ -6442,17 +6442,8 @@ function displayArticleContentInContainer (dirEntry, htmlArticle) {
     // }
 
     // Replace all TeX SVGs with MathJax scripts
-    if (params.useMathJax) {
-        // Deal with any newer MathML blocks
-        htmlArticle = htmlArticle.replace(/(<math\b[^>]+alttext=(["']))((?:[^"']|[\s\S](?!\2))+?)(\2(?:[^<]|<(?!\/math))+(?:[^<]|<(?!img))+)<img\b[^>]+?class=["'][^"']*?mwe-math-fallback-image[^>]+>/ig,
-        function (_p0, p1, _p2, math, p4) {
-            // Remove any rogue ampersands in MathJax due to double escaping (by Wikipedia)
-            math = math.replace(/&amp;/g, '&');
-            // Change any mbox commands to fbox (because KaTeX doesn't support mbox)
-            math = math.replace(/mbox{/g, 'fbox{');
-            return p1 + math + p4 + '<script type="math/tex">' + math + '</script>';
-        });
-        // Older math blocks
+    if (params.useMathJax && appstate.wikimediaZimLoaded) {
+        // Make any Wikimedia MathJax compatible with KaTeX
         htmlArticle = htmlArticle.replace(/<img\s+(?=[^>]+?math-fallback-image)[^>]*?alt\s*=\s*(['"])((?:[^"']|(?!\1)[\s\S])+)[^>]+>/ig,
         function (p0, p1, math) {
             // Remove any rogue ampersands in MathJax due to double escaping (by Wikipedia)