diff --git a/server/app.py b/server/app.py
index 9740c83..ba6ee4b 100644
--- a/server/app.py
+++ b/server/app.py
@@ -10,7 +10,7 @@ import sys
 from multiprocessing import Process, Manager
 
 thread_manager = Manager()
-TUBE_INDEX = thread_manager.Array()
+TUBE_INDEX = thread_manager.list()
 
 app = Flask(__name__)