diff --git a/unpacked/extensions/toMathML.js b/unpacked/extensions/toMathML.js
index 821d8085c..ccd788ebd 100644
--- a/unpacked/extensions/toMathML.js
+++ b/unpacked/extensions/toMathML.js
@@ -51,14 +51,14 @@ MathJax.Hub.Register.LoadHook("[MathJax]/jax/element/mml/jax.js",function () {
     },
 
     toMathMLattributes: function () {
-      var attr = [], defaults = this.defaults;
+      var defaults = (this.type === "mstyle" ? MML.math.prototype.defaults : this.defaults);
       var names = (this.attrNames||MML.copyAttributeNames),
           skip = MML.skipAttributes, copy = MML.copyAttributes;
+      var attr = [];
 
       if (this.type === "math" && (!this.attr || !this.attr.xmlns))
         {attr.push('xmlns="http://www.w3.org/1998/Math/MathML"')}
       if (!this.attrNames) {
-        if (this.type === "mstyle") {defaults = MML.math.prototype.defaults}
         for (var id in defaults) {if (!skip[id] && !copy[id] && defaults.hasOwnProperty(id)) {
           if (this[id] != null && this[id] !== defaults[id]) {
             if (this.Get(id,null,1) !== this[id])
diff --git a/unpacked/jax/output/NativeMML/jax.js b/unpacked/jax/output/NativeMML/jax.js
index 99e68dcb6..fcf687562 100644
--- a/unpacked/jax/output/NativeMML/jax.js
+++ b/unpacked/jax/output/NativeMML/jax.js
@@ -491,17 +491,18 @@
       //
       NativeMMLattributes: function (tag) {
 	var defaults = (this.type === "mstyle" ? MML.math.prototype.defaults : this.defaults);
-	var copy = (this.attrNames||MML.copyAttributeNames), skip = MML.skipAttributes;
+        var names = (this.attrNames||MML.copyAttributeNames),
+            skip = MML.skipAttributes, copy = MML.copyAttributes;
         if (!this.attrNames) {
-          for (var id in defaults) {if (!skip[id] && defaults.hasOwnProperty(id)) {
-	    if (this[id] != null && this[id] !== defaults[id]) {tag.setAttribute(id,this.NativeMMLattribute(this[id]))}
+          for (var id in defaults) {if (!skip[id] && !copy[id] && defaults.hasOwnProperty(id)) {
+	    if (this[id] != null && this[id] !== defaults[id]) 
+              tag.setAttribute(id,this.NativeMMLattribute(this[id]));
           }}
         }
-	for (var i = 0, m = copy.length; i < m; i++) {
-          if (defaults.hasOwnProperty(copy[i])) {
-             var value = (this.attr||{})[copy[i]]; if (value == null) {value = this[copy[i]]}
-	     if (value != null) {tag.setAttribute(copy[i],this.NativeMMLattribute(value))}
-           }
+	for (var i = 0, m = names.length; i < m; i++) {
+          if (copy[names[i]] === 1 && !defaults.hasOwnProperty(names[i])) continue;
+          var value = (this.attr||{})[names[i]]; if (value == null) {value = this[names[i]]}
+          if (value != null) {tag.setAttribute(names[i],this.NativeMMLattribute(value))}
 	}
         this.NativeMMLclass(tag);
       },