diff --git a/pkg/services/object/sign.go b/pkg/services/object/sign.go
index 35367aafe..f5ae97b62 100644
--- a/pkg/services/object/sign.go
+++ b/pkg/services/object/sign.go
@@ -10,8 +10,6 @@ import (
 )
 
 type SignService struct {
-	key *ecdsa.PrivateKey
-
 	sigSvc *util.SignService
 
 	svc ServiceServer
@@ -48,7 +46,6 @@ type getRangeStreamSigner struct {
 
 func NewSignService(key *ecdsa.PrivateKey, svc ServiceServer) *SignService {
 	return &SignService{
-		key:    key,
 		sigSvc: util.NewUnarySignService(key),
 		svc:    svc,
 	}