diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 78ac48d..17216b7 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -2529,7 +2529,7 @@
 static int
 sg_last_dev(void)
 {
-	int k = 0;
+	int k = -1;
 	unsigned long iflags;
 
 	read_lock_irqsave(&sg_index_lock, iflags);