diff --git a/mcproto/packets/v757/handshaking/handshake.py b/mcproto/packets/v757/handshaking/handshake.py
index 1907284b..65cdb822 100644
--- a/mcproto/packets/v757/handshaking/handshake.py
+++ b/mcproto/packets/v757/handshaking/handshake.py
@@ -34,6 +34,8 @@ class Handshake(ServerBoundPacket):
     PACKET_ID: ClassVar[int] = 0x00
     GAME_STATE: ClassVar[GameState] = GameState.HANDSHAKING
 
+    __slots__ = ("protocol_version", "server_address", "server_port", "next_state")
+
     def __init__(
         self,
         *,