diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 489935d5f22d..5792878dbff6 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1168,7 +1168,7 @@ static void retrieve_status(struct dm_table *table,
 		spec->sector_start = ti->begin;
 		spec->length = ti->len;
 		strncpy(spec->target_type, ti->type->name,
-			sizeof(spec->target_type));
+			sizeof(spec->target_type) - 1);
 
 		outptr += sizeof(struct dm_target_spec);
 		remaining = len - (outptr - outbuf);