diff --git a/airoha/an7581/base-files/etc/system_layout/emmc.json b/airoha/an7581/base-files/etc/system_layout/emmc.json
index 88a8da578a5e16399268ef4e59b4c2ab5a3e8fa1..4676ae81dc3939967dfe703b35e1ee4b99719776 100644
--- a/airoha/an7581/base-files/etc/system_layout/emmc.json
+++ b/airoha/an7581/base-files/etc/system_layout/emmc.json
@@ -9,7 +9,7 @@
     {
       "id": 2,
       "name": "B",
-      "rootfs": "/dev/mmcblk0p67",
+      "rootfs": "/dev/mmcblk0p66",
       "overlay": "/tmp/rootfs_data2"
     }
   ],