diff --git a/libnfc/drivers/pn53x_usb.c b/libnfc/drivers/pn53x_usb.c
index 6300d96..448449b 100644
--- a/libnfc/drivers/pn53x_usb.c
+++ b/libnfc/drivers/pn53x_usb.c
@@ -404,8 +404,8 @@ pn53x_usb_receive (nfc_device_t * pnd, byte_t * pbtData, const size_t szDataLen)
   int abort_fd = 0;
 
   switch (CHIP_DATA (pnd)->ui8LastCommand) {
-  case InAutoPoll:
   case TgInitAsTarget:
+  case InJumpForDEP:
   case TgGetData:
     abort_fd = pnd->iAbortFds[1];
     break;
@@ -453,8 +453,6 @@ read:
     return false;
   }
 
-  pn53x_usb_ack (pnd);
-
   const byte_t pn53x_preamble[3] = { 0x00, 0x00, 0xff };
   if (0 != (memcmp (abtRxBuf, pn53x_preamble, 3))) {
     ERR ("%s", "Frame preamble+start code mismatch");