diff --git a/public/res/settings.js b/public/res/settings.js
index 3d41c3fb..6580bf4b 100644
--- a/public/res/settings.js
+++ b/public/res/settings.js
@@ -15,7 +15,7 @@ define([
 		defaultContent: "\n\n\n> Written with [StackEdit](" + constants.MAIN_URL + ").",
 		commitMsg: "Published with " + constants.MAIN_URL,
 		conflictMode: 'merge',
-		markdownMimeType: 'text/x-markdown',
+		markdownMimeType: 'text/plain',
 		gdriveMultiAccount: 1,
 		gdriveFullAccess: true,
 		dropboxFullAccess: true,
diff --git a/public/res/storage.js b/public/res/storage.js
index b4c5b3b9..4af5bcd2 100644
--- a/public/res/storage.js
+++ b/public/res/storage.js
@@ -255,6 +255,16 @@ define([
 		version = "v20";
 	}
 
+	if(version == 'v20') {
+		if(_.has(localStorage, 'settings')) {
+			settings = JSON.parse(localStorage.settings);
+			// Force use of text/plain
+			delete settings.markdownMimeType;
+			localStorage.settings = JSON.stringify(settings);
+		}
+		version = "v21";
+	}
+
     localStorage.version = version;
     return localStorage;
 });