diff --git a/telethon/utils.py b/telethon/utils.py
index 8fbd9f48..203d3f35 100644
--- a/telethon/utils.py
+++ b/telethon/utils.py
@@ -67,7 +67,7 @@ TG_JOIN_RE = re.compile(
 # See https://telegram.org/blog/inline-bots#how-does-it-work
 VALID_USERNAME_RE = re.compile(
     r'^([a-z](?:(?!__)\w){3,30}[a-z\d]'
-    r'|gif|vid|pic|bing|wiki|imdb|bold|vote|like|coub)$',
+    r'|gif|vid|pic|bing|wiki|imdb|bold|vote|like|coub|replies)$',
     re.IGNORECASE
 )