diff --git a/core/modules/deserializers.js b/core/modules/deserializers.js
index 979f58c2e..8b9b7dc63 100644
--- a/core/modules/deserializers.js
+++ b/core/modules/deserializers.js
@@ -86,7 +86,7 @@ exports["application/json"] = function(text,fields) {
 
 /*
 Parse an HTML file into tiddlers. There are three possibilities:
-# A TiddlyWiki classic HTML file containing `text/vnd.tiddlywiki2` tiddlers
+# A TiddlyWiki classic HTML file containing `text/x-tiddlywiki` tiddlers
 # A TiddlyWiki5 HTML file containing `text/vnd.tiddlywiki` tiddlers
 # An ordinary HTML file
 */
@@ -117,7 +117,7 @@ function deserializeTiddlyWikiFile(text,storeAreaEnd,isTiddlyWiki5,fields) {
 	var results = [],
 		endOfDivRegExp = /(<\/div>\s*)/gi,
 		startPos = storeAreaEnd,
-		defaultType = isTiddlyWiki5 ? "text/vnd.tiddlywiki": "text/vnd.tiddlywiki2";
+		defaultType = isTiddlyWiki5 ? undefined : "text/x-tiddlywiki";
 	endOfDivRegExp.lastIndex = startPos;
 	var match = endOfDivRegExp.exec(text);
 	while(match) {
diff --git a/core/modules/parsers/textparser.js b/core/modules/parsers/textparser.js
index 968c87c67..85c5d4426 100644
--- a/core/modules/parsers/textparser.js
+++ b/core/modules/parsers/textparser.js
@@ -24,7 +24,7 @@ var TextParser = function(type,text,options) {
 };
 
 exports["text/plain"] = TextParser;
-exports["text/vnd.tiddlywiki2"] = TextParser;
+exports["text/x-tiddlywiki"] = TextParser;
 exports["application/javascript"] = TextParser;
 exports["application/json"] = TextParser;
 exports["text/css"] = TextParser;