diff --git a/go/cmd/pserver/pserver.go b/go/cmd/pserver/pserver.go
index 48351ab6d016b3594a4d983ba0980b2b0eb11c89..b331b8126cadc2c5df516fb241913415b2e3e73d 100644
--- a/go/cmd/pserver/pserver.go
+++ b/go/cmd/pserver/pserver.go
@@ -34,7 +34,7 @@ func main() {
 
 	var idx int
 
-	var cp *pserver.Checkpoint
+	var cp pserver.Checkpoint
 	var e *pserver.EtcdClient
 	if *index >= 0 {
 		idx = *index
diff --git a/go/pserver/service.go b/go/pserver/service.go
index 65db6970a703606cb74dc9f7677757f16f1e7181..a0319000eefa66cd8f4a8dc7d7308b771fe03a5e 100644
--- a/go/pserver/service.go
+++ b/go/pserver/service.go
@@ -119,7 +119,7 @@ func NewCheckpointFromFile(cpPath string, idx int, e *EtcdClient) (*Checkpoint,
 
 // NewService creates a new service, will bypass etcd registration if no
 // endpoints specified. It will recovery from checkpoint file if a exists a specified checkpoint.
-func NewService(idx int, interval time.Duration, path string, client *EtcdClient, cp *Checkpoint) (*Service, error) {
+func NewService(idx int, interval time.Duration, path string, client *EtcdClient, cp Checkpoint) (*Service, error) {
 	s := &Service{
 		idx:                idx,
 		checkpointInterval: interval,
@@ -130,7 +130,7 @@ func NewService(idx int, interval time.Duration, path string, client *EtcdClient
 	s.initialized = make(chan struct{})
 
 	if cp != nil {
-		for _, item := range *cp {
+		for _, item := range cp {
 			p := ParameterWithConfig{
 				Param:  item.Param,
 				Config: item.Config,