diff --git a/build_library/disk_layout.json b/build_library/disk_layout.json
index 1649b3ae30..de27813a09 100644
--- a/build_library/disk_layout.json
+++ b/build_library/disk_layout.json
@@ -16,9 +16,9 @@
         "features": ["syslinux"]
       },
       "2":{
-        "label":"BOOT-B",
-        "type":"coreos-reserved",
-        "blocks":"131072"
+        "label":"BIOS-BOOT",
+        "type":"bios",
+        "blocks":"4096"
       },
       "3":{
         "label":"USR-A",