diff --git a/types/friendly-errors-webpack-plugin/index.d.ts b/types/friendly-errors-webpack-plugin/index.d.ts
index 7e2937c867..969b8065ac 100644
--- a/types/friendly-errors-webpack-plugin/index.d.ts
+++ b/types/friendly-errors-webpack-plugin/index.d.ts
@@ -4,37 +4,39 @@
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.4
 
-import { Plugin } from 'webpack';
+import { Plugin, Compiler } from 'webpack';
 
 export = FriendlyErrorsWebpackPlugin;
 
 declare class FriendlyErrorsWebpackPlugin extends Plugin {
-	constructor(options?: FriendlyErrorsWebpackPlugin.Options);
+    constructor(options?: FriendlyErrorsWebpackPlugin.Options);
+
+    apply(compiler: Compiler): void;
 }
 
 declare namespace FriendlyErrorsWebpackPlugin {
-	enum Severity {
-		Error = "error",
-		Warning = "warning",
-	}
+    enum Severity {
+        Error = "error",
+        Warning = "warning",
+    }
 
-	interface Options {
-		compilationSuccessInfo?: {
-			messages: string[],
-			notes: string[],
-		};
-		onErrors?(severity: Severity, errors: string): void;
-		clearConsole?: boolean;
-		additionalFormatters?: Array<(errors: WebpackError[], type: Severity) => string[]>;
-		additionalTransformers?: Array<(error: any) => any>;
-	}
+    interface Options {
+        compilationSuccessInfo?: {
+            messages: string[],
+            notes: string[],
+        };
+        onErrors?(severity: Severity, errors: string): void;
+        clearConsole?: boolean;
+        additionalFormatters?: Array<(errors: WebpackError[], type: Severity) => string[]>;
+        additionalTransformers?: Array<(error: any) => any>;
+    }
 
-	interface WebpackError {
-		message: string;
-		file: string;
-		origin: string;
-		name: string;
-		severity: Severity;
-		webpackError: any;
-	}
+    interface WebpackError {
+        message: string;
+        file: string;
+        origin: string;
+        name: string;
+        severity: Severity;
+        webpackError: any;
+    }
 }