diff --git a/modules/luci-mod-admin-full/luasrc/model/cbi/admin_network/dhcp.lua b/modules/luci-mod-admin-full/luasrc/model/cbi/admin_network/dhcp.lua
index fbde431df8..3b030143e4 100644
--- a/modules/luci-mod-admin-full/luasrc/model/cbi/admin_network/dhcp.lua
+++ b/modules/luci-mod-admin-full/luasrc/model/cbi/admin_network/dhcp.lua
@@ -297,6 +297,11 @@ mac = s:option(Value, "mac", translate("<abbr title=\"Media Access Control\">MAC
 mac.datatype = "list(macaddr)"
 mac.rmempty  = true
 
+function mac.cfgvalue(self, section)
+	local val = Value.cfgvalue(self, section)
+	return ipc.checkmac(val) or val
+end
+
 ip = s:option(Value, "ip", translate("<abbr title=\"Internet Protocol Version 4\">IPv4</abbr>-Address"))
 ip.datatype = "or(ip4addr,'ignore')"