diff --git a/target/linux/mcs814x/base-files/etc/config/network b/target/linux/mcs814x/base-files/etc/config/network
index 1ebe4a301e..e24e824293 100644
--- a/target/linux/mcs814x/base-files/etc/config/network
+++ b/target/linux/mcs814x/base-files/etc/config/network
@@ -10,3 +10,4 @@ config interface lan
 	option ifname	eth0
 	option proto	static
 	option ipaddr	192.168.1.1
+	option netmask	255.255.255.0