diff --git a/build/cli.cjs b/build/cli.cjs
index 2a9b043bf9..13aa24799b 100755
--- a/build/cli.cjs
+++ b/build/cli.cjs
@@ -62,7 +62,7 @@ var import_util = require("./util.cjs");
 function transformMarkdown(buf) {
   var _a2;
   const output = [];
-  const tabRe = /^(  +|\t)/;
+  const tabRe = /^(    +|\t)/;
   const codeBlockRe = new RegExp("^(?<fence>(`{3,20}|~{3,20}))(?:(?<js>(js|javascript|ts|typescript))|(?<bash>(sh|shell|bash))|.*)$");
   let state = "root";
   let codeBlockEnd = "";
diff --git a/build/cli.js b/build/cli.js
old mode 100644
new mode 100755
diff --git a/src/md.ts b/src/md.ts
index 3e88b95d75..9348a36e45 100644
--- a/src/md.ts
+++ b/src/md.ts
@@ -17,7 +17,7 @@ import { bufToString } from './util.ts'
 
 export function transformMarkdown(buf: Buffer | string): string {
   const output = []
-  const tabRe = /^(  +|\t)/
+  const tabRe = /^(    +|\t)/
   const codeBlockRe =
     /^(?<fence>(`{3,20}|~{3,20}))(?:(?<js>(js|javascript|ts|typescript))|(?<bash>(sh|shell|bash))|.*)$/
   let state = 'root'
diff --git a/test/md.test.ts b/test/md.test.ts
index 412940d6c4..3490aac513 100644
--- a/test/md.test.ts
+++ b/test/md.test.ts
@@ -19,7 +19,7 @@ import { transformMarkdown } from '../src/md.ts'
 describe('md', () => {
   test('transformMarkdown()', () => {
     assert.equal(transformMarkdown('\n'), '// \n// ')
-    assert.equal(transformMarkdown('  \n    '), '  \n    ')
+    assert.equal(transformMarkdown('  \n    '), '//   \n//     ')
     assert.equal(
       transformMarkdown(`
 \t~~~js