diff --git a/Source/SocketIOClient.swift b/Source/SocketIOClient.swift
index 4f41ed2..aaf36ef 100644
--- a/Source/SocketIOClient.swift
+++ b/Source/SocketIOClient.swift
@@ -424,6 +424,7 @@ public final class SocketIOClient: NSObject, SocketEngineClient, SocketParsable
     /**
      Same as connect
      */
+    @available(*, deprecated=6.0)
     public func open() {
         connect()
     }