diff --git a/unpacked/jax/element/mml/jax.js b/unpacked/jax/element/mml/jax.js
index e37929acd..e4372d831 100644
--- a/unpacked/jax/element/mml/jax.js
+++ b/unpacked/jax/element/mml/jax.js
@@ -561,8 +561,8 @@ MathJax.ElementJax.mml.Augment({
         if (!def) {def = this.CheckRange(mo)}
         if (!def && nodefault) {def = {}} else {
           if (!def) {def = MathJax.Hub.Insert({},this.defaultDef)}
+          if (this.parent) {this.def = def} else {def = MathJax.Hub.Insert({},def)}
           def.form = forms[0];
-          this.def = def;
         }
       }
       this.useMMLspacing &= ~(this.SPACE_ATTR[name] || 0);
@@ -802,7 +802,7 @@ MathJax.ElementJax.mml.Augment({
         this.getPrevClass(prev); prev = null;
         for (i = 0; i < m; i++)
           {if (this.data[i]) {prev = this.data[i].setTeXclass(prev)}}
-        this.texClass = MML.TEXCLASS.INNER;
+        if (!this.hasOwnProperty("texClass")) this.texClass = MML.TEXCLASS.INNER;
         return this;
       } else {
         //
@@ -824,7 +824,6 @@ MathJax.ElementJax.mml.Augment({
   MML.mfrac = MML.mbase.Subclass({
     type: "mfrac", num: 0, den: 1,
     linebreakContainer: true,
-    texClass: MML.TEXCLASS.INNER,
     isEmbellished: MML.mbase.childEmbellished,
     Core: MML.mbase.childCore,
     CoreMO: MML.mbase.childCoreMO,
diff --git a/unpacked/jax/input/TeX/jax.js b/unpacked/jax/input/TeX/jax.js
index 42fdef145..aa6cdd9bc 100644
--- a/unpacked/jax/input/TeX/jax.js
+++ b/unpacked/jax/input/TeX/jax.js
@@ -185,7 +185,6 @@
         var mml = MML.mfrac(this.num,this.mmlData(false));
         if (this.thickness != null) {mml.linethickness = this.thickness}
         if (this.open || this.close) {
-          mml.texClass = MML.TEXCLASS.INNER;
           mml.texWithDelims = true;
           mml = TEX.fixedFence(this.open,mml,this.close);
         }
@@ -2194,7 +2193,7 @@
      *  Create an mrow that has \mathchoice using \bigg and \big for the delimiters
      */
     fixedFence: function (open,mml,close) {
-      var mrow = MML.mrow().With({open:open, close:close, texClass:MML.TEXCLASS.INNER});
+      var mrow = MML.mrow().With({open:open, close:close, texClass:MML.TEXCLASS.ORD});
       if (open) {mrow.Append(this.mathPalette(open,"l"))}
       if (mml.type === "mrow") {mrow.Append.apply(mrow,mml.data)} else {mrow.Append(mml)}
       if (close) {mrow.Append(this.mathPalette(close,"r"))}