diff --git a/source files/simplemde.js b/source files/simplemde.js
index 1618dd4..c51b9fe 100644
--- a/source files/simplemde.js	
+++ b/source files/simplemde.js	
@@ -534,6 +534,7 @@ SimpleMDE.prototype.render = function(el) {
 		mode: 'gfm',
 		theme: 'paper',
 		tabSize: (options.tabSize != undefined) ? options.tabSize : 2,
+		indentUnit: (options.tabSize != undefined) ? options.tabSize : 2,
 		indentWithTabs: (options.indentWithTabs === false) ? false : true,
 		lineNumbers: false,
 		autofocus: (options.autofocus === true) ? true : false,