diff --git a/armsrc/iso15693.c b/armsrc/iso15693.c
index 5e5a7f1e..8e86e432 100644
--- a/armsrc/iso15693.c
+++ b/armsrc/iso15693.c
@@ -2696,6 +2696,7 @@ void SimTagIso15693(uint32_t parameter, uint8_t *uid) {
 		}
 	}
 
+	cmd_send(CMD_ACK,1,0,0,0,0);
    	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
 	LEDsoff();
 }