diff --git a/go/base/utils_test.go b/go/base/utils_test.go
index 9c8ce3f..fa3a07e 100644
--- a/go/base/utils_test.go
+++ b/go/base/utils_test.go
@@ -6,6 +6,7 @@
 package base
 
 import (
+	gosql "database/sql"
 	"testing"
 
 	"github.com/github/gh-ost/go/mysql"
@@ -17,6 +18,10 @@ func init() {
 	log.SetLevel(log.ERROR)
 }
 
+func newMysqlPort(port int64) gosql.NullInt64 {
+	return gosql.NullInt64{Int64: port, Valid: port > 0}
+}
+
 func TestStringContainsAll(t *testing.T) {
 	s := `insert,delete,update`
 
@@ -41,8 +46,8 @@ func TestValidateConnection(t *testing.T) {
 	{
 		migrationContext := &MigrationContext{Log: NewDefaultLogger()}
 		serverInfo := &mysql.ServerInfo{
-			Port:      mysql.NewPort(mysql.DefaultInstancePort),
-			ExtraPort: mysql.NewPort(mysql.DefaultInstancePort + 1),
+			Port:      newMysqlPort(mysql.DefaultInstancePort),
+			ExtraPort: newMysqlPort(mysql.DefaultInstancePort + 1),
 		}
 		test.S(t).ExpectNil(ValidateConnection(serverInfo, connectionConfig, migrationContext, "test"))
 	}
@@ -77,7 +82,7 @@ func TestValidateConnection(t *testing.T) {
 	{
 		migrationContext := &MigrationContext{Log: NewDefaultLogger()}
 		serverInfo := &mysql.ServerInfo{
-			ExtraPort: mysql.NewPort(mysql.DefaultInstancePort),
+			ExtraPort: newMysqlPort(mysql.DefaultInstancePort),
 		}
 		test.S(t).ExpectNil(ValidateConnection(serverInfo, connectionConfig, migrationContext, "test"))
 	}
@@ -85,8 +90,8 @@ func TestValidateConnection(t *testing.T) {
 	{
 		migrationContext := &MigrationContext{Log: NewDefaultLogger()}
 		serverInfo := &mysql.ServerInfo{
-			Port:      mysql.NewPort(12345),
-			ExtraPort: mysql.NewPort(mysql.DefaultInstancePort),
+			Port:      newMysqlPort(12345),
+			ExtraPort: newMysqlPort(mysql.DefaultInstancePort),
 		}
 		test.S(t).ExpectNil(ValidateConnection(serverInfo, connectionConfig, migrationContext, "test"))
 	}
@@ -94,7 +99,7 @@ func TestValidateConnection(t *testing.T) {
 	{
 		migrationContext := &MigrationContext{Log: NewDefaultLogger()}
 		serverInfo := &mysql.ServerInfo{
-			Port: mysql.NewPort(9999),
+			Port: newMysqlPort(9999),
 		}
 		test.S(t).ExpectNotNil(ValidateConnection(serverInfo, connectionConfig, migrationContext, "test"))
 	}
diff --git a/go/mysql/server_info.go b/go/mysql/server_info.go
index 1a0db30..c4e3e37 100644
--- a/go/mysql/server_info.go
+++ b/go/mysql/server_info.go
@@ -7,20 +7,12 @@ package mysql
 
 import gosql "database/sql"
 
-// Port represents a MySQL server port.
-type Port *gosql.NullInt64
-
-// NewPort creates a new Port.
-func NewPort(port int64) Port {
-	return Port{Int64: port, Valid: port > 0}
-}
-
 // ServerInfo represents the online config of a MySQL server.
 type ServerInfo struct {
 	Version         string
 	VersionComment  string
 	Hostname        string
-	Port            Port
+	Port            gosql.NullInt64
 	BinlogFormat    string
 	BinlogRowImage  string
 	LogBin          bool
@@ -29,7 +21,7 @@ type ServerInfo struct {
 	TimeZone        string
 
 	// @@global.extra_port is Percona/MariaDB-only
-	ExtraPort Port
+	ExtraPort gosql.NullInt64
 }
 
 // GetServerInfo returns a ServerInfo struct representing