diff --git a/types/webpack/index.d.ts b/types/webpack/index.d.ts
index e90ad0b13b..432ba822a4 100644
--- a/types/webpack/index.d.ts
+++ b/types/webpack/index.d.ts
@@ -783,7 +783,7 @@ declare namespace webpack {
             /**
              * An object containing `content` and `name`.
              */
-            manifest: { content: string, name: string };
+            manifest: { content: string, name: string } | string;
 
             /**
              * The name where the DLL is exposed.