diff --git a/webpack/webpack-env.d.ts b/webpack/webpack-env.d.ts
index 01ea6e404..f67b9c5d6 100644
--- a/webpack/webpack-env.d.ts
+++ b/webpack/webpack-env.d.ts
@@ -28,7 +28,7 @@ declare namespace __WebpackModuleApi {
          *
          * This creates a chunk. The chunk can be named. If a chunk with this name already exists, the dependencies are merged into that chunk and that chunk is used.
          */
-        ensure: (paths: string[], callback: (require: <T>(path: string) => T) => void) => void;
+        ensure: (paths: string[], callback: (require: <T>(path: string) => T) => void, chunkName?: string) => void;
         context: (path: string, deep?: boolean, filter?: RegExp) => RequireContext;
         /**
          * Returns the module id of a dependency. The call is sync. No request to the server is fired. The compiler ensures that the dependency is available.
@@ -100,4 +100,4 @@ declare var __non_webpack_require__: any;
 /**
  * Equals the config option debug
  */
-declare var DEBUG: boolean;
\ No newline at end of file
+declare var DEBUG: boolean;