diff --git a/libnfc/drivers/pn532_uart.c b/libnfc/drivers/pn532_uart.c
index 09a75a4..0e1c0d5 100644
--- a/libnfc/drivers/pn532_uart.c
+++ b/libnfc/drivers/pn532_uart.c
@@ -283,7 +283,7 @@ int
 pn532_uart_wakeup(nfc_device *pnd)
 {
   /* High Speed Unit (HSU) wake up consist to send 0x55 and wait a "long" delay for PN532 being wakeup. */
-  const uint8_t pn532_wakeup_preamble[] = { 0x55, 0x55, 0x00, 0x00, 0x00 };
+  const uint8_t pn532_wakeup_preamble[] = { 0x55, 0x55, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
   int res = uart_send(DRIVER_DATA(pnd)->port, pn532_wakeup_preamble, sizeof(pn532_wakeup_preamble), 0);
   CHIP_DATA(pnd)->power_mode = NORMAL; // PN532 should now be awake
   return res;