diff --git a/pkg/services/tree/ape.go b/pkg/services/tree/ape.go
index f5872150..76ec254f 100644
--- a/pkg/services/tree/ape.go
+++ b/pkg/services/tree/ape.go
@@ -19,9 +19,7 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 )
 
-var (
-	subjectNotFoundErrorMessage = "subject not found"
-)
+var subjectNotFoundErrorMessage = "subject not found"
 
 func (s *Service) checkAPE(container *core.Container, cid cid.ID, operation acl.Op, role acl.Role, publicKey *keys.PublicKey) error {
 	namespace := ""