diff --git a/package/boot/uboot-tools/uboot-envtools/files/ramips b/package/boot/uboot-tools/uboot-envtools/files/ramips
index 8d53524a2c..3ec3da6988 100644
--- a/package/boot/uboot-tools/uboot-envtools/files/ramips
+++ b/package/boot/uboot-tools/uboot-envtools/files/ramips
@@ -85,7 +85,8 @@ zyxel,wsm20)
 	ubootenv_add_uci_config "/dev/mtd1" "0x0" "0x20000" "0x20000"
 	;;
 haier,har-20s2u1|\
-sim,simax1800t)
+sim,simax1800t|\
+sim,simax1800u)
 	ubootenv_add_uci_config "/dev/mtd1" "0x0" "0x20000" "0x20000"
 	ubootenv_add_uci_sys_config "/dev/mtd1" "0x40000" "0x40000" "0x20000"
 	;;