diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 41891db2010887b9a263be57befff65abe682839..5ed473a87589c4fae6649f604d53609cd1d0926a 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -114,7 +114,7 @@ static int check_set(unsigned long long *val, char *src)
 {
 	char *last;
 
-	if (strncmp(src, "-", 20) == 0) {
+	if (strcmp(src, "-") == 0) {
 		*val = SCAN_WILD_CARD;
 	} else {
 		/*