diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index a2f85ee1ae57..bb6b0e7fb910 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -6640,7 +6640,7 @@ static int scsi_debug_sdev_configure(struct scsi_device *sdp,
 	if (sdebug_ptype == TYPE_TAPE) {
 		if (!devip->tape_blocks[0]) {
 			devip->tape_blocks[0] =
-				kzalloc_objs(struct tape_block, TAPE_UNITS);
+				kzalloc_objs(struct tape_block, TAPE_UNITS + 1);
 			if (!devip->tape_blocks[0])
 				return 1;
 		}