diff --git a/pkg/core/storagegroup/storagegroup.go b/pkg/core/storagegroup/storagegroup.go
index 06ab6ad3f..73c9e90d1 100644
--- a/pkg/core/storagegroup/storagegroup.go
+++ b/pkg/core/storagegroup/storagegroup.go
@@ -4,9 +4,9 @@ import (
 	"context"
 
 	"github.com/nspcc-dev/neofs-node/pkg/core/client"
-	"github.com/nspcc-dev/neofs-sdk-go/container/id"
+	cid "github.com/nspcc-dev/neofs-sdk-go/container/id"
 	"github.com/nspcc-dev/neofs-sdk-go/netmap"
-	"github.com/nspcc-dev/neofs-sdk-go/object/id"
+	oid "github.com/nspcc-dev/neofs-sdk-go/object/id"
 	"github.com/nspcc-dev/neofs-sdk-go/storagegroup"
 )
 
@@ -46,3 +46,29 @@ type SGSource interface {
 	// container and netmap state.
 	GetSG(GetSGPrm) (*storagegroup.StorageGroup, error)
 }
+
+// StorageGroup combines storage group object ID and its structure.
+type StorageGroup struct {
+	id oid.ID
+	sg storagegroup.StorageGroup
+}
+
+// ID returns object ID of the storage group.
+func (s StorageGroup) ID() oid.ID {
+	return s.id
+}
+
+// SetID sets an object ID of the storage group.
+func (s *StorageGroup) SetID(id oid.ID) {
+	s.id = id
+}
+
+// StorageGroup returns the storage group descriptor.
+func (s StorageGroup) StorageGroup() storagegroup.StorageGroup {
+	return s.sg
+}
+
+// SetStorageGroup sets a storage group descriptor.
+func (s *StorageGroup) SetStorageGroup(sg storagegroup.StorageGroup) {
+	s.sg = sg
+}
diff --git a/pkg/innerring/processors/audit/process.go b/pkg/innerring/processors/audit/process.go
index 29596de52..091299300 100644
--- a/pkg/innerring/processors/audit/process.go
+++ b/pkg/innerring/processors/audit/process.go
@@ -15,7 +15,6 @@ import (
 	cid "github.com/nspcc-dev/neofs-sdk-go/container/id"
 	"github.com/nspcc-dev/neofs-sdk-go/netmap"
 	oid "github.com/nspcc-dev/neofs-sdk-go/object/id"
-	storagegroupSDK "github.com/nspcc-dev/neofs-sdk-go/storagegroup"
 	"go.uber.org/zap"
 )
 
@@ -172,8 +171,9 @@ func (ap *Processor) findStorageGroups(cnr cid.ID, shuffled netmapcore.Nodes) []
 }
 
 func (ap *Processor) filterExpiredSG(cid cid.ID, sgIDs []oid.ID,
-	cnr [][]netmap.NodeInfo, nm netmap.NetMap) map[oid.ID]storagegroupSDK.StorageGroup {
-	sgs := make(map[oid.ID]storagegroupSDK.StorageGroup, len(sgIDs))
+	cnr [][]netmap.NodeInfo, nm netmap.NetMap) []storagegroup.StorageGroup {
+	sgs := make([]storagegroup.StorageGroup, 0, len(sgIDs))
+	var coreSG storagegroup.StorageGroup
 
 	var getSGPrm storagegroup.GetSGPrm
 	getSGPrm.CID = cid
@@ -202,7 +202,10 @@ func (ap *Processor) filterExpiredSG(cid cid.ID, sgIDs []oid.ID,
 
 		// filter expired epochs
 		if sg.ExpirationEpoch() > ap.epochSrc.EpochCounter() {
-			sgs[sgID] = *sg
+			coreSG.SetID(sgID)
+			coreSG.SetStorageGroup(*sg)
+
+			sgs = append(sgs, coreSG)
 		}
 	}
 
diff --git a/pkg/services/audit/auditor/por.go b/pkg/services/audit/auditor/por.go
index e5f0a2d54..d07fd0aef 100644
--- a/pkg/services/audit/auditor/por.go
+++ b/pkg/services/audit/auditor/por.go
@@ -17,11 +17,11 @@ func (c *Context) executePoR() {
 	wg := new(sync.WaitGroup)
 	sgs := c.task.StorageGroupList()
 
-	for id, sg := range sgs {
+	for _, sg := range sgs {
 		wg.Add(1)
 
 		if err := c.porWorkerPool.Submit(func() {
-			c.checkStorageGroupPoR(id, sg)
+			c.checkStorageGroupPoR(sg.ID(), sg.StorageGroup())
 			wg.Done()
 		}); err != nil {
 			wg.Done()
diff --git a/pkg/services/audit/task.go b/pkg/services/audit/task.go
index d5832947f..b45c09441 100644
--- a/pkg/services/audit/task.go
+++ b/pkg/services/audit/task.go
@@ -3,11 +3,10 @@ package audit
 import (
 	"context"
 
+	"github.com/nspcc-dev/neofs-node/pkg/core/storagegroup"
 	"github.com/nspcc-dev/neofs-sdk-go/container"
 	cid "github.com/nspcc-dev/neofs-sdk-go/container/id"
 	"github.com/nspcc-dev/neofs-sdk-go/netmap"
-	oid "github.com/nspcc-dev/neofs-sdk-go/object/id"
-	storagegroupSDK "github.com/nspcc-dev/neofs-sdk-go/storagegroup"
 )
 
 // Task groups groups the container audit parameters.
@@ -24,7 +23,7 @@ type Task struct {
 
 	cnrNodes [][]netmap.NodeInfo
 
-	sgList map[oid.ID]storagegroupSDK.StorageGroup
+	sgList []storagegroup.StorageGroup
 }
 
 // WithReporter sets audit report writer.
@@ -112,7 +111,7 @@ func (t *Task) ContainerNodes() [][]netmap.NodeInfo {
 }
 
 // WithStorageGroupList sets a list of storage groups from container under audit.
-func (t *Task) WithStorageGroupList(sgList map[oid.ID]storagegroupSDK.StorageGroup) *Task {
+func (t *Task) WithStorageGroupList(sgList []storagegroup.StorageGroup) *Task {
 	if t != nil {
 		t.sgList = sgList
 	}
@@ -121,6 +120,6 @@ func (t *Task) WithStorageGroupList(sgList map[oid.ID]storagegroupSDK.StorageGro
 }
 
 // StorageGroupList returns list of storage groups from container under audit.
-func (t *Task) StorageGroupList() map[oid.ID]storagegroupSDK.StorageGroup {
+func (t *Task) StorageGroupList() []storagegroup.StorageGroup {
 	return t.sgList
 }