diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index f44dbf69843a23ee53a8548f580d13380d89d9ae..34c66118dfc473aaf39fa34a2fa74dc55bc1a502 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -504,7 +504,7 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_dh_data *h)
 {
 	struct scsi_sense_hdr sense_hdr;
 	int len, k, off, valid_states = 0;
-	char *ucp;
+	unsigned char *ucp;
 	unsigned err;
 	unsigned long expiry, interval = 10;