diff --git a/build_library/legacy_disk_layout.json b/build_library/legacy_disk_layout.json
index 0f21ffb..14d63b7 100644
--- a/build_library/legacy_disk_layout.json
+++ b/build_library/legacy_disk_layout.json
@@ -110,7 +110,7 @@
         "type":"rootfs",
         "fs_format":"ext2",
         "blocks":"4194304",
-        "fs_blocks":"262144",
+        "fs_blocks":"313344",
         "uuid": "clear"
       },
       {
@@ -130,8 +130,7 @@
         "_comment": "Shrunken rootfs partition to support smaller USB sticks.",
         "_comment": "installation will expand this to size from base.",
         "num": 3,
-        "blocks":"2539520",
-        "fs_blocks":"262144"
+        "blocks":"2539520"
       },
       {
         "_comment": "Slot B rootfs, unused on USB, but pad to 2M.",
@@ -174,8 +173,7 @@
         "_comment": "The offset to the beginning of this partition, and the FS",
         "_comment": "size must match base exactly to allow secure boot.",
         "num": 3,
-        "blocks":"2539520",
-        "fs_blocks":"262144"
+        "blocks":"2539520"
       },
       {
         "_comment": "Slot B rootfs, unused on USB, but pad to 2M.",