diff --git a/dronecan/driver/python_can.py b/dronecan/driver/python_can.py
index a457d73..d7be798 100644
--- a/dronecan/driver/python_can.py
+++ b/dronecan/driver/python_can.py
@@ -136,8 +136,6 @@ def close(self):
         def receive(self, timeout=None):
             self._check_write_feedback()
 
-            timeout = -1 if timeout is None else (timeout * 1000)
-
             try:
                 msg = self._bus.recv(timeout=timeout)
                 if msg is not None: