diff --git a/fs/super.c b/fs/super.c
index 5fdf7ff..a3bc935 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -865,7 +865,7 @@
 	else if (error)
 		return -EAGAIN;
 
-	if ((dev & MAX_ID_MASK) == (1 << MINORBITS)) {
+	if ((dev & MAX_IDR_MASK) == (1 << MINORBITS)) {
 		spin_lock(&unnamed_dev_lock);
 		ida_remove(&unnamed_dev_ida, dev);
 		if (unnamed_dev_start > dev)