diff --git a/src/class_receiveDataThread.py b/src/class_receiveDataThread.py
index c3b37865..56373458 100644
--- a/src/class_receiveDataThread.py
+++ b/src/class_receiveDataThread.py
@@ -118,7 +118,7 @@ class receiveDataThread(threading.Thread):
             except socket.error as err:
                 if err.errno in (errno.EAGAIN, errno.EWOULDBLOCK) or \
                     (sys.platform.startswith('win') and \
-                    err.errno in (errno.WSAEWOULDBLOCK)):
+                    err.errno == errno.WSAEWOULDBLOCK):
                     select.select([self.sslSock if isSSL else self.sock], [], [], 10)
                     logger.debug('sock.recv retriable error')
                     continue
diff --git a/src/class_sendDataThread.py b/src/class_sendDataThread.py
index 667850cd..7defb634 100644
--- a/src/class_sendDataThread.py
+++ b/src/class_sendDataThread.py
@@ -100,7 +100,7 @@ class sendDataThread(threading.Thread):
             except socket.error as e:
                 if e.errno in (errno.EAGAIN, errno.EWOULDBLOCK) or \
                     (sys.platform.startswith('win') and \
-                    e.errno in (errno.WSAEWOULDBLOCK)):
+                    e.errno == errno.WSAEWOULDBLOCK):
                     select.select([], [self.sslSock if isSSL else self.sock], [], 10)
                     logger.debug('sock.recv retriable error')
                     continue