diff --git a/types/case-sensitive-paths-webpack-plugin/case-sensitive-paths-webpack-plugin-tests.ts b/types/case-sensitive-paths-webpack-plugin/case-sensitive-paths-webpack-plugin-tests.ts
index a4370cff73..2c09b7e3c9 100644
--- a/types/case-sensitive-paths-webpack-plugin/case-sensitive-paths-webpack-plugin-tests.ts
+++ b/types/case-sensitive-paths-webpack-plugin/case-sensitive-paths-webpack-plugin-tests.ts
@@ -1,15 +1,20 @@
-import { Configuration } from 'webpack';
+import { Compiler, Configuration, Plugin } from 'webpack';
 import CaseSensitivePathsWebpackPlugin = require('case-sensitive-paths-webpack-plugin');
 
 const options: CaseSensitivePathsWebpackPlugin.Options = {
     debug: true,
 };
+const compiler: Compiler = new Compiler();
+const plugin: Plugin = new CaseSensitivePathsWebpackPlugin();
+
+plugin.apply(compiler);
 
 const c: Configuration = {
     plugins: [
         new CaseSensitivePathsWebpackPlugin(),
         new CaseSensitivePathsWebpackPlugin({
-            debug: true
+            debug: true,
         }),
+        plugin,
     ],
 };
diff --git a/types/case-sensitive-paths-webpack-plugin/index.d.ts b/types/case-sensitive-paths-webpack-plugin/index.d.ts
index 58cdccf25f..208766a904 100644
--- a/types/case-sensitive-paths-webpack-plugin/index.d.ts
+++ b/types/case-sensitive-paths-webpack-plugin/index.d.ts
@@ -4,12 +4,14 @@
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
-import { Plugin } from 'webpack';
+import { Plugin, Compiler } from 'webpack';
 
 export = CaseSensitivePathsWebpackPlugin;
 
 declare class CaseSensitivePathsWebpackPlugin extends Plugin {
     constructor(options?: CaseSensitivePathsWebpackPlugin.Options);
+
+    apply(compiler: Compiler): void;
 }
 
 declare namespace CaseSensitivePathsWebpackPlugin {
diff --git a/types/html-webpack-plugin/index.d.ts b/types/html-webpack-plugin/index.d.ts
index 25b615a7be..090e4c5323 100644
--- a/types/html-webpack-plugin/index.d.ts
+++ b/types/html-webpack-plugin/index.d.ts
@@ -6,14 +6,16 @@
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
-import { Plugin, compilation } from 'webpack';
+import { Plugin, compilation, Compiler } from 'webpack';
 import { AsyncSeriesWaterfallHook } from 'tapable';
 import { Options as HtmlMinifierOptions } from 'html-minifier';
 
 export = HtmlWebpackPlugin;
 
 declare class HtmlWebpackPlugin extends Plugin {
-	constructor(options?: HtmlWebpackPlugin.Options);
+    constructor(options?: HtmlWebpackPlugin.Options);
+
+    apply(compiler: Compiler): void;
 }
 
 declare namespace HtmlWebpackPlugin {