diff --git a/types/megajs/index.d.ts b/types/megajs/index.d.ts
index 8162d6d648..731c5e5b1e 100644
--- a/types/megajs/index.d.ts
+++ b/types/megajs/index.d.ts
@@ -50,7 +50,7 @@ export interface MakeDirectoryOptions {
 export interface FileOptions {
   downloadId: string;
   key: string;
-  directory: boolean;
+  directory?: boolean;
 }
 
 export interface StorageOptions {