diff --git a/drivers/media/dvb/siano/sms-cards.c b/drivers/media/dvb/siano/sms-cards.c
index e21638969cd357ec2a296e7d4c78ee3b18bb4cd9..1067b22eb0c66992567124baac7f6c1fe43f1bd4 100644
--- a/drivers/media/dvb/siano/sms-cards.c
+++ b/drivers/media/dvb/siano/sms-cards.c
@@ -97,7 +97,7 @@ static struct sms_board sms_boards[] = {
 	},
 };
 
-struct sms_board *sms_get_board(int id)
+struct sms_board *sms_get_board(unsigned id)
 {
 	BUG_ON(id >= ARRAY_SIZE(sms_boards));
 
diff --git a/drivers/media/dvb/siano/sms-cards.h b/drivers/media/dvb/siano/sms-cards.h
index 38f062f6ad68a95c462a49afeb196ad37b580b07..8f19fc000b46914d8afb98810e06f1c1890d2711 100644
--- a/drivers/media/dvb/siano/sms-cards.h
+++ b/drivers/media/dvb/siano/sms-cards.h
@@ -81,7 +81,7 @@ struct sms_board {
 	int led_power, led_hi, led_lo, lna_ctrl, rf_switch;
 };
 
-struct sms_board *sms_get_board(int id);
+struct sms_board *sms_get_board(unsigned id);
 
 extern struct smscore_device_t *coredev;