diff --git a/src/libopensc/card-cardos.c b/src/libopensc/card-cardos.c
index d0a62823..710e17ef 100644
--- a/src/libopensc/card-cardos.c
+++ b/src/libopensc/card-cardos.c
@@ -1190,14 +1190,19 @@ static int cardos_get_serialnr(sc_card_t *card, sc_serial_number_t *serial)
 	LOG_TEST_RET(card->ctx, r,  "APDU transmit failed");
 	if (apdu.sw1 != 0x90 || apdu.sw2 != 0x00)
 		return SC_ERROR_INTERNAL;
-	if (apdu.resplen != 32) {
+	if ((apdu.resplen == 8) && (card->type == SC_CARD_TYPE_CARDOS_V5_0)) {
+		/* cache serial number */
+		memcpy(card->serialnr.value, rbuf, 8);
+		card->serialnr.len = 8;
+	} else if (apdu.resplen == 32) {
+		/* cache serial number */
+		memcpy(card->serialnr.value, &rbuf[10], 6);
+		card->serialnr.len = 6;
+	} else {
 		sc_log(card->ctx,  "unexpected response to GET DATA serial"
 				" number\n");
 		return SC_ERROR_INTERNAL;
 	}
-	/* cache serial number */
-	memcpy(card->serialnr.value, &rbuf[10], 6);
-	card->serialnr.len = 6;
 	/* copy and return serial number */
 	memcpy(serial, &card->serialnr, sizeof(*serial));
 	return SC_SUCCESS;