diff --git a/airoha/an7581/base-files/etc/system_layout/emmc.json b/airoha/an7581/base-files/etc/system_layout/emmc.json
index 6b19c6188da4b127c4493bdae2bfbeb9685e50cf..db21375430013303ff3f9564167f508b84532fc1 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": "/dev/mmcblk0p68"
     }
   ],