diff --git a/webpack/index.d.ts b/webpack/index.d.ts
index 8b5a4d9938..1a762b29a5 100644
--- a/webpack/index.d.ts
+++ b/webpack/index.d.ts
@@ -759,7 +759,10 @@ declare namespace webpack {
 
     namespace optimize {
         class AggressiveMergingPlugin extends Plugin {
-            constructor(options: any);
+            constructor(options?: {
+                minSize?: number;
+                maxSize?: number;
+            });
         }
 
         class CommonsChunkPlugin extends Plugin {