diff --git a/debian-mirror-tools/config/debian/common/base-bullseye.yaml b/debian-mirror-tools/config/debian/common/base-bullseye.yaml
index 6edbe87b..58d14e8c 100644
--- a/debian-mirror-tools/config/debian/common/base-bullseye.yaml
+++ b/debian-mirror-tools/config/debian/common/base-bullseye.yaml
@@ -85,7 +85,7 @@ ostree:
   OSTREE_GRUB_PW_FILE: $OECORE_NATIVE_SYSROOT/usr/share/bootfs/boot_keys/ostree_grub_pw
   OSTREE_FDISK_BLM: 2506
   OSTREE_FDISK_BSZ: 512
-  OSTREE_FDISK_RSZ: 4096
+  OSTREE_FDISK_RSZ: 20480
   OSTREE_FDISK_VSZ: 0
   OSTREE_FDISK_FSZ: 32
   OSTREE_CONSOLE: console=ttyS0,115200 console=tty1