1 files changed, 1 insertions, 1 deletions

diff --git a/utils/hwstub/stub/rk27xx/usb_drv_rk27xx.c b/utils/hwstub/stub/rk27xx/usb_drv_rk27xx.c
index 3706e76b35..d20b1d2b6b 100644
--- a/utils/hwstub/stub/rk27xx/usb_drv_rk27xx.c
+++ b/utils/hwstub/stub/rk27xx/usb_drv_rk27xx.c
@@ -310,7 +310,7 @@ void INT_UDC(void)
         /* TODO handle errors */
         if (rxstat & RXACK)        /* RxACK */
         {
-            int xfer_size = RX0STAT & 0xffff;
+            int xfer_size = rxstat & 0x7ff;
             ctrlep[DIR_OUT].cnt -= xfer_size;
 
             if (ctrlep[DIR_OUT].cnt > 0 && xfer_size == 64)