diff --git a/src/TcpConnector.php b/src/TcpConnector.php
index ddd5bd3..62d4b5f 100644
--- a/src/TcpConnector.php
+++ b/src/TcpConnector.php
@@ -65,6 +65,8 @@ public function checkConnectedSocket($socket)
         // The following hack looks like the only way to
         // detect connection refused errors with PHP's stream sockets.
         if (false === stream_socket_get_name($socket, true)) {
+            fclose($socket);
+
             return Promise\reject(new ConnectionException('Connection refused'));
         }