diff --git a/unpacked/extensions/mml2jax.js b/unpacked/extensions/mml2jax.js
index a348bc55e..8edb8d5c1 100644
--- a/unpacked/extensions/mml2jax.js
+++ b/unpacked/extensions/mml2jax.js
@@ -99,8 +99,8 @@ MathJax.Extension.mml2jax = {
     }
     for (var i = 0, m = math.length; i < m; i++) {
       var parent = math[i].parentNode;
-      if (parent && parent.className !== preview && !math[i].prefix === !namespace)
-        {array.push(math[i])}
+      if (parent && parent.className !== preview &&
+         !parent.isMathJax && !math[i].prefix === !namespace) array.push(math[i]);
     }
   },