diff --git a/common/usb_cdc.c b/common/usb_cdc.c
index b4e357b17..3c04198d4 100644
--- a/common/usb_cdc.c
+++ b/common/usb_cdc.c
@@ -741,8 +741,7 @@ void AT91F_USB_SendData(AT91PS_UDP pUdp, const char *pData, uint32_t length) {
 //*----------------------------------------------------------------------------
 void AT91F_USB_SendZlp(AT91PS_UDP pUdp) {
 	UDP_SET_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_TXPKTRDY);	
-	while ( !(pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_TXPKTRDY) );
-	
+	while ( !(pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_TXCOMP) );
 	UDP_CLEAR_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_TXCOMP);
 	while (pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_TXCOMP);
 }