diff --git a/unpacked/jax/input/TeX/jax.js b/unpacked/jax/input/TeX/jax.js
index bb8263788..1c1f8f69f 100644
--- a/unpacked/jax/input/TeX/jax.js
+++ b/unpacked/jax/input/TeX/jax.js
@@ -343,7 +343,8 @@
     type: "fn",
     checkItem: function (item) {
       if (this.data[0]) {
-        if (item.type !== "fn" && item.type !== "left") {
+        if (item.isOpen) {return true}
+        if (item.type !== "fn") {
           if (item.type !== "mml" || !item.data[0]) {return [this.data[0],item]}
           if (item.data[0].isa(MML.mspace)) {return [this.data[0],item]}
           var mml = item.data[0]; if (mml.isEmbellished()) {mml = mml.CoreMO()}