diff --git a/flight/PiOS/STM32F10x/pios_usb_com.c b/flight/PiOS/STM32F10x/pios_usb_com.c
index a9c9b4bb7..ac758b808 100644
--- a/flight/PiOS/STM32F10x/pios_usb_com.c
+++ b/flight/PiOS/STM32F10x/pios_usb_com.c
@@ -490,7 +490,7 @@ static void PIOS_USB_COM_CDC_DATA_EP_OUT_Callback(void)
 		SetEPRxStatus(usb_com_dev->cfg->data_rx_ep, EP_RX_VALID);
 	} else {
 		/* Not enough room left for a message, apply backpressure */
-		SetEPRxStatus(usb_com_dev->cfg->data_rx_ep, EP_RX_STALL);
+		SetEPRxStatus(usb_com_dev->cfg->data_rx_ep, EP_RX_NAK);
 	}
 
 #if defined(PIOS_INCLUDE_FREERTOS)