diff --git a/types/uglifyjs-webpack-plugin/index.d.ts b/types/uglifyjs-webpack-plugin/index.d.ts
index 88ce8296ae..fbbb42f3a8 100644
--- a/types/uglifyjs-webpack-plugin/index.d.ts
+++ b/types/uglifyjs-webpack-plugin/index.d.ts
@@ -33,6 +33,11 @@ declare namespace UglifyJsPlugin {
         output?: object;
         compress?: boolean | object;
         warnings?: boolean;
+        toplevel?: boolean;
+        nameCache?: object;
+        keep_classnames?: boolean;
+        keep_fnames?: boolean;
+        safari10?: boolean;
     }
 
     interface ExtractCommentsOptions {