diff --git a/lib/statemachine/group.go b/lib/statemachine/group.go
index 5322b0665..2c8562955 100644
--- a/lib/statemachine/group.go
+++ b/lib/statemachine/group.go
@@ -25,12 +25,12 @@ type StateGroup struct {
 	sms map[datastore.Key]*StateMachine
 }
 
-// stateType: T - (reflect.TypeOf(MyStateStruct{}))
-func New(ds datastore.Datastore, hnd StateHandler, stateType reflect.Type) *StateGroup {
+// stateType: T - (MyStateStruct{})
+func New(ds datastore.Datastore, hnd StateHandler, stateType interface{}) *StateGroup {
 	return &StateGroup{
 		sts:       statestore.New(ds),
 		hnd:       hnd,
-		stateType: stateType,
+		stateType: reflect.TypeOf(stateType),
 
 		sms: map[datastore.Key]*StateMachine{},
 	}
diff --git a/lib/statemachine/machine_test.go b/lib/statemachine/machine_test.go
index d445a5283..49b8324ce 100644
--- a/lib/statemachine/machine_test.go
+++ b/lib/statemachine/machine_test.go
@@ -2,7 +2,6 @@ package statemachine
 
 import (
 	"context"
-	"reflect"
 	"testing"
 
 	"github.com/ipfs/go-datastore"
@@ -67,7 +66,7 @@ func TestBasic(t *testing.T) {
 
 		th := &testHandler{t: t, done: make(chan struct{}), proceed: make(chan struct{})}
 		close(th.proceed)
-		smm := New(ds, th, reflect.TypeOf(TestState{}))
+		smm := New(ds, th, TestState{})
 
 		if err := smm.Send(uint64(2), &TestEvent{A: "start"}); err != nil {
 			t.Fatalf("%+v", err)
@@ -82,7 +81,7 @@ func TestPersist(t *testing.T) {
 		ds := datastore.NewMapDatastore()
 
 		th := &testHandler{t: t, done: make(chan struct{}), proceed: make(chan struct{})}
-		smm := New(ds, th, reflect.TypeOf(TestState{}))
+		smm := New(ds, th, TestState{})
 
 		if err := smm.Send(uint64(2), &TestEvent{A: "start"}); err != nil {
 			t.Fatalf("%+v", err)
@@ -93,7 +92,7 @@ func TestPersist(t *testing.T) {
 			return
 		}
 
-		smm = New(ds, th, reflect.TypeOf(TestState{}))
+		smm = New(ds, th, TestState{})
 		if err := smm.Send(uint64(2), &TestEvent{A: "restart"}); err != nil {
 			t.Fatalf("%+v", err)
 		}
diff --git a/storage/miner.go b/storage/miner.go
index ef9f72d47..5b116feec 100644
--- a/storage/miner.go
+++ b/storage/miner.go
@@ -3,7 +3,6 @@ package storage
 import (
 	"context"
 	"errors"
-	"reflect"
 	"time"
 
 	"github.com/ipfs/go-cid"
@@ -86,7 +85,7 @@ func NewMiner(api storageMinerApi, addr address.Address, h host.Host, ds datasto
 	}
 
 	// TODO: separate sector stuff from miner struct
-	m.sectors = statemachine.New(namespace.Wrap(ds, datastore.NewKey(SectorStorePrefix)), m, reflect.TypeOf(SectorInfo{}))
+	m.sectors = statemachine.New(namespace.Wrap(ds, datastore.NewKey(SectorStorePrefix)), m, SectorInfo{})
 
 	return m, nil
 }