diff --git a/shared/tinyusb/mp_usbd_cdc.c b/shared/tinyusb/mp_usbd_cdc.c
index 674d6b089947e..63d015cb461f5 100644
--- a/shared/tinyusb/mp_usbd_cdc.c
+++ b/shared/tinyusb/mp_usbd_cdc.c
@@ -102,9 +102,9 @@ mp_uint_t mp_usbd_cdc_tx_strn(const char *str, mp_uint_t len) {
n = CFG_TUD_CDC_EP_BUFSIZE;
}
if (tud_cdc_connected()) {
- int timeout = 0;
// If CDC port is connected but the buffer is full, wait for up to USC_CDC_TIMEOUT ms.
- while (n > tud_cdc_write_available() && timeout++ < MICROPY_HW_USB_CDC_TX_TIMEOUT) {
+ mp_uint_t t0 = mp_hal_ticks_ms();
+ while (n > tud_cdc_write_available() && (mp_uint_t)(mp_hal_ticks_ms() - t0) < MICROPY_HW_USB_CDC_TX_TIMEOUT) {
mp_event_wait_ms(1);
// Explicitly run the USB stack as the scheduler may be locked (eg we
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