diff --git a/demos/datagrid/index.html b/demos/datagrid/index.html
index ffd9268..158a798 100644
--- a/demos/datagrid/index.html
+++ b/demos/datagrid/index.html
@@ -34,7 +34,6 @@ a { text-decoration: none }
 <input type="file" name="xlfile" id="xlf" /> ... or click here to select a file
 <textarea id="b64data">... or paste a base64-encoding here</textarea>
 <b>Advanced Demo Options:</b>
-Use readAsBinaryString: (when available) <input type="checkbox" name="userabs" checked>
 </pre>
 <p><input type="submit" value="Export to XLSX!" id="xport" onclick="export_xlsx();" disabled="true"></p>
 <div id="htmlout"></div>
@@ -80,22 +79,16 @@ var process_wb = (function() {
 })();
 
 var do_file = (function() {
-	var rABS = typeof FileReader !== "undefined" && (FileReader.prototype||{}).readAsBinaryString;
-	var domrabs = document.getElementsByName("userabs")[0];
-	if(!rABS) domrabs.disabled = !(domrabs.checked = false);
-
 	return function do_file(files) {
-		rABS = domrabs.checked;
 		var f = files[0];
 		var reader = new FileReader();
 		reader.onload = function(e) {
-			if(typeof console !== 'undefined') console.log("onload", new Date(), rABS);
+			if(typeof console !== 'undefined') console.log("onload", new Date());
 			var data = e.target.result;
-			if(!rABS) data = new Uint8Array(data);
-			process_wb(X.read(data, {type: rABS ? 'binary' : 'array'}));
+			data = new Uint8Array(data);
+			process_wb(X.read(data, {type: 'array'}));
 		};
-		if(rABS) reader.readAsBinaryString(f);
-		else reader.readAsArrayBuffer(f);
+		reader.readAsArrayBuffer(f);
 	};
 })();