diff --git a/static/js/editors.js b/static/js/editors.js
index 95fb558..5186108 100644
--- a/static/js/editors.js
+++ b/static/js/editors.js
@@ -784,6 +784,7 @@ var editors = {
             theme: config.editorTheme,
             tabSize: config.editorTabSize,
             indentUnit: 4,
+            indentWithTabs: true,
             foldGutter: true,
             cursorHeight: 1,
             path: data.path,
diff --git a/static/js/playground.js b/static/js/playground.js
index b3f6737..2ff3338 100644
--- a/static/js/playground.js
+++ b/static/js/playground.js
@@ -187,6 +187,7 @@ var playground = {
             theme: "wide",
             tabSize: 4,
             indentUnit: 4,
+            indentWithTabs: true,
             foldGutter: true,
             cursorHeight: 1,
             viewportMargin: 500,