diff --git a/types/nodegit/tree-builder.d.ts b/types/nodegit/tree-builder.d.ts
index f5a6715492..5d489beefb 100644
--- a/types/nodegit/tree-builder.d.ts
+++ b/types/nodegit/tree-builder.d.ts
@@ -11,5 +11,5 @@ export class Treebuilder {
     get(filename: string): TreeEntry;
     insert(filename: string, id: Oid, filemode: number): Promise<TreeEntry>;
     remove(filename: string): number;
-    write(): Oid;
+    write(): Promise<Oid>;
 }