diff --git a/day16.py b/day16.py
index 1ed734f..9e6cf84 100644
--- a/day16.py
+++ b/day16.py
@@ -1,5 +1,4 @@
 from collections import deque
-from dataclasses import dataclass
 from itertools import product
 from tools.aoc import AOCDay
 from typing import Any
@@ -12,10 +11,10 @@ class Valve:
         self.tunnels: set = set()
 
 
-@dataclass(frozen=True)
 class Tunnel:
-    target: Valve
-    length: int = 1
+    def __init__(self, target: Valve, length: int = 1):
+        self.target: Valve = target
+        self.length: int = length
 
     def __str__(self):
         return f"Tunnel(target={self.target.name}, length={self.length})"