diff --git a/webpack/webpack.d.ts b/webpack/webpack.d.ts
index e2ed2d1658..96a7c710df 100644
--- a/webpack/webpack.d.ts
+++ b/webpack/webpack.d.ts
@@ -102,7 +102,7 @@ declare module "webpack" {
             /** Include comments with information about the modules. */
             pathinfo?: boolean;
             /** If set, export the bundle as library. output.library is the name. */
-            library?: boolean;
+            library?: string;
             /**
              * Which format to export the library:
              * <ul>