diff --git a/protocol/json/client_notification.go b/protocol/json/client_notification.go
index d9628e2..f2684bf 100644
--- a/protocol/json/client_notification.go
+++ b/protocol/json/client_notification.go
@@ -23,10 +23,6 @@ type ClientNotificationCodec struct {
 	noti *clientNotification
 }
 
-func (cnc *ClientNotificationCodec) HasResponse() bool {
-	return false
-}
-
 func (cnc *ClientNotificationCodec) Method() string {
 	return cnc.noti.Method
 }
diff --git a/protocol/registry_codec.go b/protocol/registry_codec.go
index 88adc7e..b0ecc68 100644
--- a/protocol/registry_codec.go
+++ b/protocol/registry_codec.go
@@ -10,6 +10,4 @@ type RegistryCodec interface {
 	// Reads the request filling the RPC method args.
 	ReadParams(args []interface{}) error
 	Params() ([]string, error)
-
-	HasResponse() bool
 }
diff --git a/protocol/server_codec.go b/protocol/server_codec.go
index e175973..00da440 100644
--- a/protocol/server_codec.go
+++ b/protocol/server_codec.go
@@ -11,5 +11,6 @@ type ServerCodec interface {
 type ServerRequestCodec interface {
 	RegistryCodec
 
+	HasResponse() bool
 	NewResponse(reply interface{}, err error) ([]byte, error)
 }