diff --git a/config/config.go b/config/config.go
index 11d4540..4ecaf6d 100644
--- a/config/config.go
+++ b/config/config.go
@@ -3,9 +3,9 @@ package config
 import (
 	"encoding/json"
 	"io/ioutil"
-)
 
-const NULL_BLOCK_NUMBER uint32 = 0xffffffff
+	shipclient "github.com/eosswedenorg-go/antelope-ship-client"
+)
 
 type RedisConfig struct {
 	Addr     string `json:"addr"`
@@ -37,8 +37,8 @@ type Config struct {
 
 func Parse(data []byte) (*Config, error) {
 	cfg := Config{
-		StartBlockNum:       NULL_BLOCK_NUMBER,
-		EndBlockNum:         NULL_BLOCK_NUMBER,
+		StartBlockNum:       shipclient.NULL_BLOCK_NUMBER,
+		EndBlockNum:         shipclient.NULL_BLOCK_NUMBER,
 		MaxMessagesInFlight: 10,
 		IrreversibleOnly:    false,
 		Redis: RedisConfig{
diff --git a/config/config_test.go b/config/config_test.go
index 9874ea9..2df3ddb 100644
--- a/config/config_test.go
+++ b/config/config_test.go
@@ -4,12 +4,14 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/require"
+
+	shipclient "github.com/eosswedenorg-go/antelope-ship-client"
 )
 
 func TestParse_Default(t *testing.T) {
 	expected := Config{
-		StartBlockNum:       NULL_BLOCK_NUMBER,
-		EndBlockNum:         NULL_BLOCK_NUMBER,
+		StartBlockNum:       shipclient.NULL_BLOCK_NUMBER,
+		EndBlockNum:         shipclient.NULL_BLOCK_NUMBER,
 		MaxMessagesInFlight: 10,
 		IrreversibleOnly:    false,
 		Redis: RedisConfig{
diff --git a/main.go b/main.go
index f4ee45f..63e9086 100644
--- a/main.go
+++ b/main.go
@@ -205,7 +205,7 @@ func main() {
 		return
 	}
 
-	if conf.StartBlockNum == config.NULL_BLOCK_NUMBER {
+	if conf.StartBlockNum == shipclient.NULL_BLOCK_NUMBER {
 		if conf.IrreversibleOnly {
 			conf.StartBlockNum = uint32(chainInfo.LastIrreversibleBlockNum)
 		} else {