diff --git a/packages/markdown-parser/src/index.ts b/packages/markdown-parser/src/index.ts
index 2bff5f2b..815887a8 100644
--- a/packages/markdown-parser/src/index.ts
+++ b/packages/markdown-parser/src/index.ts
@@ -11,7 +11,7 @@ const TAG_STRIKE = '~~'
 const TAG_CODE = '`'
 const TAG_PRE = '```'
 
-const TO_BE_ESCAPED = /[*_\-~`[\\]]/g
+const TO_BE_ESCAPED = /[*_\-~`[\\\]]/g
 
 /**
  * Markdown MessageEntity parser.