diff --git a/config.go b/config.go
index 4133aecb..89ec9e20 100644
--- a/config.go
+++ b/config.go
@@ -59,6 +59,7 @@ type dhcpState struct {
 // field ordering is important -- yaml fields will mirror ordering from here
 type dhcpConfig struct {
 	Enabled       bool   `json:"enabled" yaml:"enabled"`
+	InterfaceName string `json:"interface_name" yaml:"interface_name"` // eth0, en0 and so on
 	GatewayIP     string `json:"gateway_ip" yaml:"gateway_ip"`
 	SubnetMask    string `json:"subnet_mask" yaml:"subnet_mask"`
 	RangeStart    string `json:"range_start" yaml:"range_start"`