diff --git a/bulk-checkin.c b/bulk-checkin.c
index b728210bc7..bd6151ba3c 100644
--- a/bulk-checkin.c
+++ b/bulk-checkin.c
@@ -496,6 +496,18 @@ int index_blob_bulk_checkin_incore(struct object_id *oid,
 	return status;
 }
 
+int index_tree_bulk_checkin_incore(struct object_id *oid,
+				   const void *buf, size_t size,
+				   const char *path, unsigned flags)
+{
+	int status = deflate_obj_to_pack_incore(&bulk_checkin_packfile, oid,
+						buf, size, path, OBJ_TREE,
+						flags);
+	if (!odb_transaction_nesting)
+		flush_bulk_checkin_packfile(&bulk_checkin_packfile);
+	return status;
+}
+
 void begin_odb_transaction(void)
 {
 	odb_transaction_nesting += 1;
diff --git a/bulk-checkin.h b/bulk-checkin.h
index 1b91daeaee..89786b3954 100644
--- a/bulk-checkin.h
+++ b/bulk-checkin.h
@@ -17,6 +17,10 @@ int index_blob_bulk_checkin_incore(struct object_id *oid,
 				   const void *buf, size_t size,
 				   const char *path, unsigned flags);
 
+int index_tree_bulk_checkin_incore(struct object_id *oid,
+				   const void *buf, size_t size,
+				   const char *path, unsigned flags);
+
 /*
  * Tell the object database to optimize for adding
  * multiple objects. end_odb_transaction must be called