diff --git a/data/MathMLinHTML.js b/data/MathMLinHTML.js
deleted file mode 100644
index 2ab05c686..000000000
--- a/data/MathMLinHTML.js
+++ /dev/null
@@ -1,70 +0,0 @@
-/*
-March 19, 2004 MathHTML (c) Peter Jipsen http://www.chapman.edu/~jipsen
-Released under the GNU General Public License version 2 or later.
-See the GNU General Public License (at http://www.gnu.org/copyleft/gpl.html)
-for more details.
-*/
-
-function convertMath(node) {// for Gecko
-  if (node.nodeType==1) {
-    var newnode =
-      document.createElementNS("http://www.w3.org/1998/Math/MathML",
-        node.nodeName.toLowerCase());
-    for(var i=0; i < node.attributes.length; i++)
-      newnode.setAttribute(node.attributes[i].nodeName,
-        node.attributes[i].value);
-    for (var i=0; i<node.childNodes.length; i++) {
-      var st = node.childNodes[i].nodeValue;
-      if (st==null || st.slice(0,1)!=" " && st.slice(0,1)!="\n")
-        newnode.appendChild(convertMath(node.childNodes[i]));
-    }
-    return newnode;
-  }
-  else return node;
-}
-
-function convert() {
-  var mmlnode = document.getElementsByTagName("math");
-  var st,str,node,newnode;
-  for (var i=0; i<mmlnode.length; i++)
-    if (document.createElementNS!=null)
-      mmlnode[i].parentNode.replaceChild(convertMath(mmlnode[i]),mmlnode[i]);
-    else { // convert for IE
-      str = "";
-      node = mmlnode[i];
-      while (node.nodeName!="/MATH") {
-        st = node.nodeName.toLowerCase();
-        if (st=="#text") str += node.nodeValue;
-        else {
-          str += (st.slice(0,1)=="/" ? "</m:"+st.slice(1) : "<m:"+st);
-          if (st.slice(0,1)!="/")
-             for(var j=0; j < node.attributes.length; j++)
-               if (node.attributes[j].value!="italic" &&
-                 node.attributes[j].value!="" &&
-                 node.attributes[j].value!="inherit" &&
-                 node.attributes[j].value!=undefined)
-                 str += " "+node.attributes[j].nodeName+"="+
-                     "\""+node.attributes[j].value+"\"";
-          str += ">";
-        }
-        node = node.nextSibling;
-        node.parentNode.removeChild(node.previousSibling);
-      }
-      str += "</m:math>";
-      newnode = document.createElement("span");
-      node.parentNode.replaceChild(newnode,node);
-      newnode.innerHTML = str;
-    }
-}
-
-if (document.createElementNS==null) {
-  document.write("<object id=\"mathplayer\"\
-  classid=\"clsid:32F66A20-7614-11D4-BD11-00104BD3F987\"></object>");
-  document.write("<?import namespace=\"m\" implementation=\"#mathplayer\"?>");
-}
-if(typeof window.addEventListener != 'undefined'){
-  window.addEventListener('load', convert, false);
-}
-if(typeof window.attachEvent != 'undefined') {
-  window.attachEvent('onload', convert);
-}
diff --git a/pandoc.cabal b/pandoc.cabal
index fd2e1b585..69258d2ec 100644
--- a/pandoc.cabal
+++ b/pandoc.cabal
@@ -97,7 +97,6 @@ Data-Files:
                  data/epub.css
                  -- data for LaTeXMathML writer
                  data/LaTeXMathML.js
-                 data/MathMLinHTML.js
                  -- data for dzslides writer
                  data/dzslides/template.html
                  -- sample lua custom writer
diff --git a/pandoc.hs b/pandoc.hs
index a0899adb6..9c4e62cb4 100644
--- a/pandoc.hs
+++ b/pandoc.hs
@@ -1319,9 +1319,6 @@ convertWithOpts opts args = do
                       LaTeXMathML Nothing -> do
                          s <- readDataFileUTF8 datadir "LaTeXMathML.js"
                          return $ ("mathml-script", s) : variables
-                      MathML Nothing -> do
-                         s <- readDataFileUTF8 datadir "MathMLinHTML.js"
-                         return $ ("mathml-script", s) : variables
                       _ -> return variables
 
   variables'' <- if format == "dzslides"