diff --git a/common/net/network.go b/common/net/network.go
index 3bb5d3df0..e6e79c705 100644
--- a/common/net/network.go
+++ b/common/net/network.go
@@ -11,6 +11,7 @@ func (n Network) SystemString() string {
 	}
 }
 
+// HasNetwork returns true if the network list has a certain network.
 func HasNetwork(list []Network, network Network) bool {
 	for _, value := range list {
 		if value == network {
@@ -19,18 +20,3 @@ func HasNetwork(list []Network, network Network) bool {
 	}
 	return false
 }
-
-// HasNetwork returns true if the given network is in v NetworkList.
-func (l NetworkList) HasNetwork(network Network) bool {
-	for _, value := range l.Network {
-		if string(value) == string(network) {
-			return true
-		}
-	}
-	return false
-}
-
-// Size returns the number of networks in this network list.
-func (l NetworkList) Size() int {
-	return len(l.Network)
-}
diff --git a/proxy/dokodemo/dokodemo.go b/proxy/dokodemo/dokodemo.go
index 03ec5c591..838781970 100644
--- a/proxy/dokodemo/dokodemo.go
+++ b/proxy/dokodemo/dokodemo.go
@@ -38,7 +38,7 @@ type DokodemoDoor struct {
 
 // Init initializes the DokodemoDoor instance with necessary parameters.
 func (d *DokodemoDoor) Init(config *Config, pm policy.Manager) error {
-	if (config.NetworkList == nil || config.NetworkList.Size() == 0) && len(config.Networks) == 0 {
+	if (config.NetworkList == nil || len(config.NetworkList.Network) == 0) && len(config.Networks) == 0 {
 		return newError("no network specified")
 	}
 	d.config = config