diff --git a/serial/urlhandler/protocol_socket.py b/serial/urlhandler/protocol_socket.py
index 36cdf1f..11f6a05 100644
--- a/serial/urlhandler/protocol_socket.py
+++ b/serial/urlhandler/protocol_socket.py
@@ -249,7 +249,8 @@
         while ready:
             ready, _, _ = select.select([self._socket], [], [], 0)
             try:
-                self._socket.recv(4096)
+                if ready:
+                    ready = self._socket.recv(4096)
             except OSError as e:
                 # this is for Python 3.x where select.error is a subclass of
                 # OSError ignore BlockingIOErrors and EINTR. other errors are shown