diff --git a/index.ts b/index.ts
index 055e2bb..081ffc1 100644
--- a/index.ts
+++ b/index.ts
@@ -11,7 +11,7 @@ export class File implements Writer {
     public constructor(options: WriterOptions & { path: string }) {
         const {path, ...rest} = options
         this._options = rest
-        this.sink = file(path).writer()
+        this.sink = file(path).writer({ highWaterMark: 128 * 1024 })
     }
 
     public log(_level: Level, ...data: any[]) : void {