diff --git a/platformio/device/finder.py b/platformio/device/finder.py
index c93b9a90..0ef1b118 100644
--- a/platformio/device/finder.py
+++ b/platformio/device/finder.py
@@ -149,7 +149,7 @@ class SerialPortFinder:
             port = self._reveal_device_port(device)
 
         # pick the best PID:VID USB device
-        best_port = None
+        port = best_port = None
         for item in list_serial_ports():
             if self.ensure_ready and not is_serial_port_ready(item["port"]):
                 continue