diff --git a/src/judas_server/backend/backend_server.py b/src/judas_server/backend/backend_server.py
index b1bea71..fac89b1 100644
--- a/src/judas_server/backend/backend_server.py
+++ b/src/judas_server/backend/backend_server.py
@@ -106,7 +106,7 @@ class BackendServer:
             client (Client): The client to send the ACK to.
             target_id (str): The id of the ACK'd message.
         """
-        ack: bytes = Message.ack(target_id=target_id).to_bytes()
+        ack: bytes = Message.Control.ack(target_id=target_id).to_bytes()
         self.logger.info(f"[>] Sending ACK to {client}")
         client.outbound += ack
 
@@ -116,7 +116,7 @@ class BackendServer:
         Args:
             client (Client): The client to send the CLOSE message to.
         """
-        close_msg: bytes = Message.close().to_bytes()
+        close_msg: bytes = Message.Control.close().to_bytes()
         self.logger.info(f"[>] Sending CLOSE to {client}")
         client.outbound += close_msg