diff --git a/pkg/services/object_manager/placement/netmap.go b/pkg/services/object_manager/placement/netmap.go
index 787c04421..41267dbae 100644
--- a/pkg/services/object_manager/placement/netmap.go
+++ b/pkg/services/object_manager/placement/netmap.go
@@ -19,7 +19,7 @@ type netMapBuilder struct {
 	lastNm *netmapSDK.NetMap
 	// containerCache caches container nodes by ID. It is used to skip `GetContainerNodes` invocation if
 	// neither netmap nor container has changed.
-	containerCache simplelru.LRUCache[string, [][]netmapSDK.NodeInfo]
+	containerCache simplelru.LRUCache[cid.ID, [][]netmapSDK.NodeInfo]
 }
 
 type netMapSrc struct {
@@ -32,7 +32,7 @@ type netMapSrc struct {
 const defaultContainerCacheSize = 10
 
 func NewNetworkMapBuilder(nm *netmapSDK.NetMap) Builder {
-	cache, _ := simplelru.NewLRU[string, [][]netmapSDK.NodeInfo](defaultContainerCacheSize, nil) // no error
+	cache, _ := simplelru.NewLRU[cid.ID, [][]netmapSDK.NodeInfo](defaultContainerCacheSize, nil) // no error
 	return &netMapBuilder{
 		nmSrc:          &netMapSrc{nm: nm},
 		containerCache: cache,
@@ -40,7 +40,7 @@ func NewNetworkMapBuilder(nm *netmapSDK.NetMap) Builder {
 }
 
 func NewNetworkMapSourceBuilder(nmSrc netmap.Source) Builder {
-	cache, _ := simplelru.NewLRU[string, [][]netmapSDK.NodeInfo](defaultContainerCacheSize, nil) // no error
+	cache, _ := simplelru.NewLRU[cid.ID, [][]netmapSDK.NodeInfo](defaultContainerCacheSize, nil) // no error
 	return &netMapBuilder{
 		nmSrc:          nmSrc,
 		containerCache: cache,
@@ -62,7 +62,7 @@ func (b *netMapBuilder) BuildPlacement(cnr cid.ID, obj *oid.ID, p netmapSDK.Plac
 
 	b.mtx.Lock()
 	if nm == b.lastNm {
-		raw, ok := b.containerCache.Get(string(binCnr))
+		raw, ok := b.containerCache.Get(cnr)
 		b.mtx.Unlock()
 		if ok {
 			return BuildObjectPlacement(nm, raw, obj)
@@ -78,7 +78,7 @@ func (b *netMapBuilder) BuildPlacement(cnr cid.ID, obj *oid.ID, p netmapSDK.Plac
 	}
 
 	b.mtx.Lock()
-	b.containerCache.Add(string(binCnr), cn)
+	b.containerCache.Add(cnr, cn)
 	b.mtx.Unlock()
 
 	return BuildObjectPlacement(nm, cn, obj)