diff --git a/lib/winston/transports/index.d.ts b/lib/winston/transports/index.d.ts
index b8b6c62b8..c3eb45045 100644
--- a/lib/winston/transports/index.d.ts
+++ b/lib/winston/transports/index.d.ts
@@ -34,6 +34,7 @@ declare namespace winston {
     maxFiles?: number;
     eol?: string;
     tailable?: boolean;
+    lazy?: boolean;
   }
 
   interface FileTransportInstance extends Transport {
@@ -47,6 +48,7 @@ declare namespace winston {
     maxFiles: number | null;
     eol: string;
     tailable: boolean;
+    lazy: boolean;
 
     new(options?: FileTransportOptions): FileTransportInstance;
   }