diff --git a/src/components/preview/SimTextPreview.vue b/src/components/preview/SimTextPreview.vue
index 506f198..b6fbc1b 100644
--- a/src/components/preview/SimTextPreview.vue
+++ b/src/components/preview/SimTextPreview.vue
@@ -207,6 +207,7 @@
         mountFileId: undefined,
         saveTitle: '',
         options: {
+          tabSize: 2,
           fontSize: 14,
           contextmenu: true,
           codeLens: true,