diff --git a/libnfc/drivers/arygon.c b/libnfc/drivers/arygon.c
index 2d022ac..a64f219 100644
--- a/libnfc/drivers/arygon.c
+++ b/libnfc/drivers/arygon.c
@@ -199,6 +199,8 @@ bool arygon_transceive(nfc_device_t* pnd, const byte_t* pbtTx, const size_t szTx
   byte_t abtRxBuf[BUFFER_LENGTH];
   size_t szRxBufLen = BUFFER_LENGTH;
   size_t szPos;
+  // TODO: Move this one level up for libnfc-1.6
+  uint8_t ack_frame[] = { 0x00, 0x00, 0xff, 0x00, 0xff, 0x00 };
 
   // Packet length = data length (len) + checksum (1) + end of stream marker (1)
   abtTxBuf[4] = szTxLen;
@@ -254,6 +256,14 @@ bool arygon_transceive(nfc_device_t* pnd, const byte_t* pbtTx, const size_t szTx
   // Only succeed when the result is at least 00 00 FF xx Fx Dx xx .. .. .. xx 00 (x = variable)
   if(szRxBufLen < 9) return false;
 
+#ifdef DEBUG
+  PRINT_HEX("TX", ack_frame, 6);
+#endif
+  if (!uart_send((serial_port)pnd->nds, ack_frame, 6)) {
+    ERR("%s", "Unable to transmit data. (TX)");
+    return false;
+  }
+
   // Remove the preceding and appending bytes 00 00 ff 00 ff 00 00 00 FF xx Fx .. .. .. xx 00 (x = variable)
   *pszRxLen = szRxBufLen - 9;
   memcpy(pbtRx, abtRxBuf+7, *pszRxLen);
diff --git a/libnfc/drivers/pn532_uart.c b/libnfc/drivers/pn532_uart.c
index 0cf6bc2..709275a 100644
--- a/libnfc/drivers/pn532_uart.c
+++ b/libnfc/drivers/pn532_uart.c
@@ -181,6 +181,8 @@ bool pn532_uart_transceive(nfc_device_t* pnd, const byte_t* pbtTx, const size_t
   byte_t abtRxBuf[BUFFER_LENGTH];
   size_t szRxBufLen = BUFFER_LENGTH;
   size_t szPos;
+  // TODO: Move this one level up for libnfc-1.6
+  uint8_t ack_frame[] = { 0x00, 0x00, 0xff, 0x00, 0xff, 0x00 };
 
   // Packet length = data length (len) + checksum (1) + end of stream marker (1)
   abtTxBuf[3] = szTxLen;
@@ -236,6 +238,14 @@ bool pn532_uart_transceive(nfc_device_t* pnd, const byte_t* pbtTx, const size_t
   // Only succeed when the result is at least 00 00 FF xx Fx Dx xx .. .. .. xx 00 (x = variable)
   if(szRxBufLen < 9) return false;
 
+#ifdef DEBUG
+  PRINT_HEX("TX", ack_frame,6);
+#endif
+  if (!uart_send((serial_port)pnd->nds,ack_frame,6)) {
+    ERR("%s", "Unable to transmit data. (TX)");
+    return false;
+  }
+
   // Remove the preceding and appending bytes 00 00 ff 00 ff 00 00 00 FF xx Fx .. .. .. xx 00 (x = variable)
   *pszRxLen = szRxBufLen - 9;
   memcpy(pbtRx, abtRxBuf+7, *pszRxLen);
diff --git a/libnfc/drivers/pn53x_usb.c b/libnfc/drivers/pn53x_usb.c
index 929a45e..16bc92f 100644
--- a/libnfc/drivers/pn53x_usb.c
+++ b/libnfc/drivers/pn53x_usb.c
@@ -243,6 +243,7 @@ bool pn53x_usb_transceive(nfc_device_t* pnd, const byte_t* pbtTx, const size_t s
   byte_t abtTx[BUFFER_LENGTH] = { 0x00, 0x00, 0xff }; // Every packet must start with "00 00 ff"
   byte_t abtRx[BUFFER_LENGTH];
   usb_spec_t* pus = (usb_spec_t*)pnd->nds;
+  // TODO: Move this one level up for libnfc-1.6
   uint8_t ack_frame[] = { 0x00, 0x00, 0xff, 0x00, 0xff, 0x00 };
 
   // Packet length = data length (len) + checksum (1) + end of stream marker (1)
@@ -298,6 +299,9 @@ bool pn53x_usb_transceive(nfc_device_t* pnd, const byte_t* pbtTx, const size_t s
     PRINT_HEX("RX", abtRx,ret);
 #endif
 
+#ifdef DEBUG
+  PRINT_HEX("TX", ack_frame,6);
+#endif
   usb_bulk_write(pus->pudh, pus->uiEndPointOut, (char *)ack_frame, 6, USB_TIMEOUT);
 
   // When the answer should be ignored, just return a succesful result