diff --git a/rpc.py b/rpc.py
index 2ac63bb..d0adafe 100644
--- a/rpc.py
+++ b/rpc.py
@@ -144,7 +144,7 @@ class ClientSync(object):
 		return res
 	def authenticate(self, identity: str, *, context=('XUS SIGNON',)):
 		self._server.update(RecordServerInfo(*self('XUS SIGNON SETUP', '', '1', context=context))._asdict())
-		if identity.startswith('<?xml version="1.0" encoding="UTF-8"?>'):
+		if identity.startswith('<?xml version="1.0"'):
 			res = self('XUS ESSO VALIDATE', RPCType(tuple(identity[i:i+200] for i in range(0, len(identity), 200)), RPCType.GLOBAL))
 		else:
 			res = self('XUS AV CODE', XWBHash_encrypt(identity))
@@ -225,7 +225,7 @@ class ClientAsync(object):
 		return res
 	async def authenticate(self, identity: str, *, context=('XUS SIGNON',)):
 		self._server.update(RecordServerInfo(*await self('XUS SIGNON SETUP', '', '1', context=context))._asdict())
-		if identity.startswith('<?xml version="1.0" encoding="UTF-8"?>'):
+		if identity.startswith('<?xml version="1.0"'):
 			res = await self('XUS ESSO VALIDATE', RPCType(tuple(identity[i:i+200] for i in range(0, len(identity), 200)), RPCType.GLOBAL))
 		else:
 			res = await self('XUS AV CODE', XWBHash_encrypt(identity))