diff --git a/build_library/legacy_disk_layout.json b/build_library/legacy_disk_layout.json
index 724c93895d..1d63e0a535 100644
--- a/build_library/legacy_disk_layout.json
+++ b/build_library/legacy_disk_layout.json
@@ -16,7 +16,7 @@
         "num": 2,
         "label":"BOOT-B",
         "type":"coreos-reserved",
-        "blocks":"32768"
+        "blocks":"131072"
       },
       {
         "num": 3,