diff --git a/os/hal/src/serial_usb.c b/os/hal/src/serial_usb.c
index 237d8e027..16822502a 100644
--- a/os/hal/src/serial_usb.c
+++ b/os/hal/src/serial_usb.c
@@ -234,9 +234,9 @@ void sduStop(SerialUSBDriver *sdup) {
   chDbgAssert((sdup->state == SDU_STOP) || (sdup->state == SDU_READY),
               "sduStop(), #1",
               "invalid state");
-  usbStop(sdup->config->usbp);
   sdup->state = SDU_STOP;
   chSysUnlock();
+  usbStop(sdup->config->usbp);
 }
 
 /**