diff --git a/types/fs-extra/index.d.ts b/types/fs-extra/index.d.ts
index 82bd401c39..575df86b4d 100644
--- a/types/fs-extra/index.d.ts
+++ b/types/fs-extra/index.d.ts
@@ -289,7 +289,7 @@ export interface WriteFileOptions {
 export interface WriteOptions extends WriteFileOptions {
     fs?: object;
     replacer?: any;
-    spaces?: number;
+    spaces?: number | string;
 }
 
 export interface ReadResult {