diff --git a/registry.go b/registry.go
index 2984ed9..f64e1fd 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
-	params := methodSpec.getInterfaces()
+	pValues, pInstances := methodSpec.getParamValues()
 
-	if nil != params && 0 < len(params) {
-		if errRead := codec.ReadParams(&params); errRead != nil {
+	if nil != pInstances && 0 < len(pInstances) {
+		if errRead := codec.ReadParams(&pInstances); errRead != nil {
 			return nil, errRead
 		}
-		pCount := len(params)
+		pCount := len(pInstances)
 		in = make([]reflect.Value, pCount+1)
 		for indexI := 0; indexI < pCount; indexI++ {
-			in[indexI+1] = reflect.ValueOf(params[indexI])
+			in[indexI+1] = pValues[indexI]
 		}
 	} else {
 		in = make([]reflect.Value, 1)
diff --git a/service_map.go b/service_map.go
index 963833e..2c2b329 100644
--- a/service_map.go
+++ b/service_map.go
@@ -26,28 +26,41 @@ type service struct {
 }
 
 type serviceMethod struct {
-	method      reflect.Method // receiver method
-	paramTypes  []reflect.Type // type of the request argument
-	paramValues []reflect.Value
-	returnType  reflect.Type // type of the response argument
-	returnValue reflect.Value
+	method     reflect.Method // receiver method
+	paramTypes []reflect.Type // type of the request argument
+	returnType reflect.Type   // type of the response argument
 }
 
-func (sm *serviceMethod) getInterfaces() (instances []interface{}) {
-	if nil == sm.paramValues || 0 == len(sm.paramValues) {
-		return nil
+func (sm *serviceMethod) getParamValues() (values []reflect.Value, instances []interface{}) {
+	if nil == sm.paramTypes || 0 == len(sm.paramTypes) {
+		return nil, nil
 	}
 
-	pCount := len(sm.paramValues)
+	pCount := len(sm.paramTypes)
+	values = make([]reflect.Value, pCount)
 	instances = make([]interface{}, pCount)
 
 	for indexI := 0; indexI < pCount; indexI++ {
-		instances[indexI] = sm.paramValues[indexI].Interface()
+		values[indexI] = getValue(sm.paramTypes[indexI])
+		instances[indexI] = values[indexI].Interface()
 	}
 
 	return
 }
 
+func getValue(t reflect.Type) reflect.Value {
+	rt := t
+	if rt.Kind() == reflect.Ptr {
+		rt = rt.Elem()
+	}
+
+	rv := reflect.New(rt)
+	if rt.Kind() != reflect.Struct {
+		rv = reflect.Indirect(rv)
+	}
+	return rv
+}
+
 // ----------------------------------------------------------------------------
 // serviceMap
 // ----------------------------------------------------------------------------
@@ -90,20 +103,19 @@ Loop:
 		}
 
 		var paramTypes []reflect.Type
-		var paramValues []reflect.Value
 		var returnType reflect.Type
-		var returnValue reflect.Value
 
 		pCount := mt.NumIn() - 1
 
 		if 0 < pCount {
 			paramTypes = make([]reflect.Type, pCount)
-			paramValues = make([]reflect.Value, pCount)
 
 			for indexI := 0; indexI < pCount; indexI++ {
-				if paramTypes[indexI], paramValues[indexI], err = validateType(mt.In(indexI + 1)); nil != err {
+				pt := mt.In(indexI + 1)
+				if err = validateType(mt.In(indexI + 1)); nil != err {
 					return err
 				}
+				paramTypes[indexI] = pt
 			}
 		}
 
@@ -120,19 +132,19 @@ Loop:
 			if t := mt.Out(1); t != typeOfError {
 				continue Loop
 			}
-			if returnType, returnValue, err = validateType(mt.Out(0)); nil != err {
+			rt := mt.Out(0)
+			if err = validateType(rt); nil != err {
 				return err
 			}
+			returnType = rt
 		default:
 			continue
 		}
 
 		s.methods[m.Name] = &serviceMethod{
-			method:      m,
-			paramTypes:  paramTypes,
-			paramValues: paramValues,
-			returnType:  returnType,
-			returnValue: returnValue,
+			method:     m,
+			paramTypes: paramTypes,
+			returnType: returnType,
 		}
 	}
 	if len(s.methods) == 0 {
@@ -150,21 +162,11 @@ Loop:
 	return nil
 }
 
-func validateType(t reflect.Type) (rt reflect.Type, rv reflect.Value, err error) {
+func validateType(t reflect.Type) error {
 	if t.Kind() == reflect.Struct {
-		err = fmt.Errorf("Type is Struct. Pass by reference, i.e. *%s", t)
-		return
+		return fmt.Errorf("Type is Struct. Pass by reference, i.e. *%s", t)
 	}
-	rt = t
-	if t.Kind() == reflect.Ptr {
-		rt = t.Elem()
-	}
-
-	rv = reflect.New(rt)
-	if rt.Kind() != reflect.Struct {
-		rv = reflect.Indirect(rv)
-	}
-	return
+	return nil
 }
 
 // get returns a registered service given a method name.