diff --git a/lib/statestore/store.go b/lib/statestore/store.go
index f578c17e3..ca924d66e 100644
--- a/lib/statestore/store.go
+++ b/lib/statestore/store.go
@@ -136,7 +136,7 @@ func (st *StateStore) List(out interface{}) error {
 			return err
 		}
 
-		rout.Set(reflect.Append(rout.Elem(), elem.Elem()))
+		rout.Elem().Set(reflect.Append(rout.Elem(), elem.Elem()))
 	}
 
 	return nil
diff --git a/lib/statestore/store_test.go b/lib/statestore/store_test.go
new file mode 100644
index 000000000..667805b0c
--- /dev/null
+++ b/lib/statestore/store_test.go
@@ -0,0 +1,38 @@
+package statestore
+
+import (
+	"testing"
+
+	"github.com/ipfs/go-datastore"
+
+	"github.com/filecoin-project/lotus/chain/types"
+	"github.com/filecoin-project/lotus/lib/cborrpc"
+)
+
+func TestList(t *testing.T) {
+	ds := datastore.NewMapDatastore()
+
+	e, err := cborrpc.Dump(types.NewInt(7))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if err := ds.Put(datastore.NewKey("/2"), e); err != nil {
+		t.Fatal(err)
+	}
+
+	st := &StateStore{ds:ds}
+
+	var out []types.BigInt
+	if err := st.List(&out); err != nil {
+		t.Fatal(err)
+	}
+
+	if len(out) != 1 {
+		t.Fatal("wrong len")
+	}
+
+	if out[0].Int64() != 7 {
+		t.Fatal("wrong data")
+	}
+}