diff --git a/commonspace/headsync/headsync.go b/commonspace/headsync/headsync.go
index 60168274..f72f66db 100644
--- a/commonspace/headsync/headsync.go
+++ b/commonspace/headsync/headsync.go
@@ -23,7 +23,7 @@ type TreeHeads struct {
 
 type HeadSync interface {
 	Init(objectIds []string, deletionState deletionstate.DeletionState)
-	
+
 	UpdateHeads(id string, heads []string)
 	HandleRangeRequest(ctx context.Context, req *spacesyncproto.HeadSyncRequest) (resp *spacesyncproto.HeadSyncResponse, err error)
 	RemoveObjects(ids []string)
@@ -126,6 +126,9 @@ func (d *headSync) fillDiff(objectIds []string) {
 		})
 	}
 	d.diff.Set(els...)
+	if err := d.storage.WriteSpaceHash(d.diff.Hash()); err != nil {
+		d.log.Error("can't write space hash", zap.Error(err))
+	}
 }
 
 func concatStrings(strs []string) string {
diff --git a/commonspace/headsync/headsync_test.go b/commonspace/headsync/headsync_test.go
index bb20dfc3..2db23aff 100644
--- a/commonspace/headsync/headsync_test.go
+++ b/commonspace/headsync/headsync_test.go
@@ -46,6 +46,9 @@ func TestDiffService(t *testing.T) {
 			Id:   initId,
 			Head: "h1h2",
 		})
+		hash := "123"
+		diffMock.EXPECT().Hash().Return(hash)
+		storageMock.EXPECT().WriteSpaceHash(hash)
 		pSyncMock.EXPECT().Run()
 		service.Init([]string{initId}, delState)
 	})
diff --git a/commonspace/spacestorage/spacestorage.go b/commonspace/spacestorage/spacestorage.go
index 08469f2f..348a408b 100644
--- a/commonspace/spacestorage/spacestorage.go
+++ b/commonspace/spacestorage/spacestorage.go
@@ -37,7 +37,7 @@ type SpaceStorage interface {
 	TreeRoot(id string) (*treechangeproto.RawTreeChangeWithId, error)
 	TreeStorage(id string) (treestorage.TreeStorage, error)
 	CreateTreeStorage(payload treestorage.TreeStorageCreatePayload) (treestorage.TreeStorage, error)
-	WriteSpaceHash(head string) error
+	WriteSpaceHash(hash string) error
 	ReadSpaceHash() (hash string, err error)
 
 	Close() error