diff --git a/src/ESPAsyncTCP.cpp b/src/ESPAsyncTCP.cpp
index 8a997fa..850c432 100644
--- a/src/ESPAsyncTCP.cpp
+++ b/src/ESPAsyncTCP.cpp
@@ -264,6 +264,9 @@ bool AsyncClient::connect(IPAddress ip, uint16_t port){
   tcp_arg(pcb, this);
   tcp_err(pcb, &_s_error);
   size_t err = tcp_connect(pcb, &addr, port,(tcp_connected_fn)&_s_connected);
+  if (err != ERR_OK){
+    tcp_close(pcb);
+  }
   return (ERR_OK == err);
 }