diff --git a/block/genhd.c b/block/genhd.c
index b11a4ad..d13ba76 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -867,7 +867,7 @@
 {
 	struct gendisk *disk = dev_to_disk(dev);
 
-	return sprintf(buf, "%u\n", queue_discard_alignment(disk->queue));
+	return sprintf(buf, "%d\n", queue_discard_alignment(disk->queue));
 }
 
 static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL);