diff --git a/chrome/content/zotero/xpcom/file.js b/chrome/content/zotero/xpcom/file.js
index fdf8157cd4..dcd7e24c93 100644
--- a/chrome/content/zotero/xpcom/file.js
+++ b/chrome/content/zotero/xpcom/file.js
@@ -340,29 +340,20 @@ Zotero.File = new function(){
 			path = path.path;
 		}
 		
-		if (typeof data == 'string' && (!charset || charset.toLowerCase() == 'utf-8')) {
-			let encoder = new TextEncoder();
-			let array = encoder.encode(data);
+		if (typeof data == 'string') {
 			return Zotero.Promise.resolve(OS.File.writeAtomic(
 				path,
-				array,
+				data,
 				{
 					tmpPath: OS.Path.join(
 						Zotero.getTempDirectory().path,
 						OS.Path.basename(path) + ".tmp"
-					)
+					),
+					encoding: charset ? charset.toLowerCase() : 'utf-8'
 				}
 			));
 		}
 		
-		// Convert text data to stream
-		if(!(data instanceof Components.interfaces.nsIInputStream)) {
-			var converter = Components.classes["@mozilla.org/intl/scriptableunicodeconverter"].
-					createInstance(Components.interfaces.nsIScriptableUnicodeConverter);
-			converter.charset = charset ? Zotero.CharacterSets.getName(charset) : "UTF-8";
-			data = converter.convertToInputStream(data);
-		}
-		
 		var deferred = Zotero.Promise.defer();
 		var os = FileUtils.openSafeFileOutputStream(new FileUtils.File(path));
 		NetUtil.asyncCopy(data, os, function(inputStream, status) {