diff --git a/packages/html-parser/src/index.ts b/packages/html-parser/src/index.ts
index f73a9002..657d38bd 100644
--- a/packages/html-parser/src/index.ts
+++ b/packages/html-parser/src/index.ts
@@ -3,7 +3,7 @@ import { tl } from '@mtcute/tl'
 import { Parser } from 'htmlparser2'
 import bigInt from 'big-integer'
 
-const MENTION_REGEX = /^tg:\/\/user\?id=(\d+)(?:&hash=([0-9a-fA-F]+)(?:&|$)|&|$)/
+const MENTION_REGEX = /^tg:\/\/user\?id=(\d+)(?:&hash=(-?[0-9a-fA-F]+)(?:&|$)|&|$)/
 
 export namespace HtmlMessageEntityParser {
     /**
diff --git a/packages/markdown-parser/src/index.ts b/packages/markdown-parser/src/index.ts
index e223777f..2bff5f2b 100644
--- a/packages/markdown-parser/src/index.ts
+++ b/packages/markdown-parser/src/index.ts
@@ -2,7 +2,7 @@ import type { IMessageEntityParser, MessageEntity } from '@mtcute/client'
 import { tl } from '@mtcute/tl'
 import bigInt from 'big-integer'
 
-const MENTION_REGEX = /^tg:\/\/user\?id=(\d+)(?:&hash=([0-9a-fA-F]+)(?:&|$)|&|$)/
+const MENTION_REGEX = /^tg:\/\/user\?id=(\d+)(?:&hash=(-?[0-9a-fA-F]+)(?:&|$)|&|$)/
 
 const TAG_BOLD = '**'
 const TAG_ITALIC = '__'