diff --git a/telethon/client/auth.py b/telethon/client/auth.py
index 6f86a733..25c0444c 100644
--- a/telethon/client/auth.py
+++ b/telethon/client/auth.py
@@ -194,7 +194,7 @@ class AuthMethods(MessageParseMethods, UserMethods):
         return self
 
     async def sign_in(
-            self, phone=None, *, code=None, password=None,
+            self, phone=None, code=None, *, password=None,
             bot_token=None, phone_code_hash=None):
         """
         Starts or completes the sign in process with the given phone number