diff --git a/RNS/Interfaces/TCPInterface.py b/RNS/Interfaces/TCPInterface.py
index 08dde19..c5a9287 100644
--- a/RNS/Interfaces/TCPInterface.py
+++ b/RNS/Interfaces/TCPInterface.py
@@ -112,8 +112,8 @@ class TCPClientInterface(Interface):
         else:
             TCP_KEEPIDLE = 0x10
 
-        sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
-        sock.setsockopt(socket.IPPROTO_TCP, TCP_KEEPIDLE, int(TCPClientInterface.TCP_PROBE_AFTER))
+        self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
+        self.socket.setsockopt(socket.IPPROTO_TCP, TCP_KEEPIDLE, int(TCPClientInterface.TCP_PROBE_AFTER))
 
     def detach(self):
         if self.socket != None:
@@ -421,4 +421,4 @@ class TCPInterfaceHandler(socketserver.BaseRequestHandler):
         socketserver.BaseRequestHandler.__init__(self, *args, **keys)
 
     def handle(self):
-        self.callback(handler=self)
\ No newline at end of file
+        self.callback(handler=self)