diff --git a/codec/codec.go b/codec/codec.go
index 74b07e6c..fa5c98e9 100644
--- a/codec/codec.go
+++ b/codec/codec.go
@@ -23,7 +23,7 @@ var (
 )
 
 var (
-	DefaultMaxMessageSize = 1024 * 1024 * 4 // 4Mb
+	DefaultMaxMsgSize = 1024 * 1024 * 4 // 4Mb
 )
 
 // MessageType
@@ -62,12 +62,12 @@ type Message struct {
 type Option func(*Options)
 
 type Options struct {
-	MaxMessageSize int64
+	MaxMsgSize int64
 }
 
-func MaxMessageSize(n int64) Option {
+func MaxMsgSize(n int64) Option {
 	return func(o *Options) {
-		o.MaxMessageSize = n
+		o.MaxMsgSize = n
 	}
 }
 
diff --git a/server/options.go b/server/options.go
index aa91f956..fb4a31e1 100644
--- a/server/options.go
+++ b/server/options.go
@@ -16,6 +16,8 @@ import (
 	"github.com/unistack-org/micro/v3/tracer"
 )
 
+type Option func(*Options)
+
 // Options server struct
 type Options struct {
 	Codecs       map[string]codec.Codec
diff --git a/server/server.go b/server/server.go
index 5fb1a3b3..9badf18e 100644
--- a/server/server.go
+++ b/server/server.go
@@ -15,6 +15,20 @@ var (
 	DefaultServer Server = NewServer()
 )
 
+var (
+	DefaultAddress          = ":0"
+	DefaultName             = "server"
+	DefaultVersion          = "latest"
+	DefaultId               = uuid.New().String()
+	DefaultRegisterCheck    = func(context.Context) error { return nil }
+	DefaultRegisterInterval = time.Second * 30
+	DefaultRegisterTTL      = time.Second * 90
+	DefaultNamespace        = "micro"
+	DefaultMaxMsgSize       = 1024 * 1024 * 4 // 4Mb
+	DefaultMaxMsgRecvSize   = 1024 * 1024 * 4 // 4Mb
+	DefaultMaxMsgSendSize   = 1024 * 1024 * 4 // 4Mb
+)
+
 // Server is a simple micro server abstraction
 type Server interface {
 	// Initialise options
@@ -134,16 +148,3 @@ type Subscriber interface {
 	Endpoints() []*registry.Endpoint
 	Options() SubscriberOptions
 }
-
-type Option func(*Options)
-
-var (
-	DefaultAddress          = ":0"
-	DefaultName             = "server"
-	DefaultVersion          = "latest"
-	DefaultId               = uuid.New().String()
-	DefaultRegisterCheck    = func(context.Context) error { return nil }
-	DefaultRegisterInterval = time.Second * 30
-	DefaultRegisterTTL      = time.Second * 90
-	DefaultNamespace        = "micro"
-)