diff --git a/doc/board/nokia/rx51.rst b/doc/board/nokia/rx51.rst
index 061fe76..7c6647b 100644
--- a/doc/board/nokia/rx51.rst
+++ b/doc/board/nokia/rx51.rst
@@ -158,8 +158,7 @@
 
     CONFIG_CMD_UBI=y
     CONFIG_CMD_UBIFS=y
-    CONFIG_MTD_UBI_FASTMAP=y
-    CONFIG_MTD_UBI_FASTMAP_AUTOCONVERT=1
+    CONFIG_MTD_UBI_BEB_LIMIT=10
 
 Run in QEMU
 -----------