diff --git a/protocol/json/client_notify.go b/protocol/json/client_notify.go
index d5ea9aa..2fb5762 100644
--- a/protocol/json/client_notify.go
+++ b/protocol/json/client_notify.go
@@ -47,7 +47,7 @@ func (ccn *ClientCodecNotify) Method() string {
 	return ccn.notify.Method
 }
 
-func (ccn *ClientCodecNotify) ReadParams(args []interface{}) error {
+func (ccn *ClientCodecNotify) ReadParams(args *[]interface{}) error {
 	if ccn.err == nil && ccn.notify.Params != nil {
 		// Note: if scr.request.Params is nil it's not an error, it's an optional member.
 		// JSON params structured object. Unmarshal to the args object.
diff --git a/protocol/json/server.go b/protocol/json/server.go
index 878122e..fc580ff 100644
--- a/protocol/json/server.go
+++ b/protocol/json/server.go
@@ -160,11 +160,11 @@ func (scr *ServerCodecRequest) Method() string {
 // absence of expected names MAY result in an error being
 // generated. The names MUST match exactly, including
 // case, to the method's expected parameters.
-func (scr *ServerCodecRequest) ReadParams(args []interface{}) error {
+func (scr *ServerCodecRequest) ReadParams(args *[]interface{}) error {
 	if scr.err == nil && scr.request.Params != nil {
 		// Note: if scr.request.Params is nil it's not an error, it's an optional member.
 		// JSON params structured object. Unmarshal to the args object.
-		if err := json.Unmarshal(*scr.request.Params, &args); err != nil {
+		if err := json.Unmarshal(*scr.request.Params, args); err != nil {
 			// Clearly JSON params is not a structured object,
 			// fallback and attempt an unmarshal with JSON params as
 			// array value and RPC params is struct. Unmarshal into
diff --git a/protocol/registry_codec.go b/protocol/registry_codec.go
index 61d76ca..d4fa450 100644
--- a/protocol/registry_codec.go
+++ b/protocol/registry_codec.go
@@ -8,6 +8,6 @@ type RegistryCodec interface {
 	// Reads the request and returns the RPC method name.
 	Method() string
 	// Reads the request filling the RPC method args.
-	ReadParams([]interface{}) error
+	ReadParams(args *[]interface{}) error
 	Complete()
 }
diff --git a/registry.go b/registry.go
index 8f926b2..2984ed9 100644
--- a/registry.go
+++ b/registry.go
@@ -77,16 +77,16 @@ func (rr *rpcRegistry) Invoke(codec protocol.RegistryCodec) (result interface{},
 	// Decode the args.
 
 	var in []reflect.Value
-	paramValues := methodSpec.paramValues
+	params := methodSpec.getInterfaces()
 
-	if nil != paramValues {
-		params := methodSpec.getInterfaces()
-		if errRead := codec.ReadParams(params); errRead != nil {
+	if nil != params && 0 < len(params) {
+		if errRead := codec.ReadParams(&params); errRead != nil {
 			return nil, errRead
 		}
-		in = make([]reflect.Value, len(paramValues)+1)
-		for indexI := 0; indexI < len(paramValues); indexI++ {
-			in[indexI+1] = paramValues[indexI]
+		pCount := len(params)
+		in = make([]reflect.Value, pCount+1)
+		for indexI := 0; indexI < pCount; indexI++ {
+			in[indexI+1] = reflect.ValueOf(params[indexI])
 		}
 	} else {
 		in = make([]reflect.Value, 1)