diff --git a/types/content-type/content-type-tests.ts b/types/content-type/content-type-tests.ts
index 0705d440c1..4be9519a94 100644
--- a/types/content-type/content-type-tests.ts
+++ b/types/content-type/content-type-tests.ts
@@ -1,18 +1,19 @@
-import contentType = require('content-type');
-import express = require('express');
+/// <reference types="node" />
 
-let obj = contentType.parse('image/svg+xml; charset=utf-8');
+import * as contentType from 'content-type';
+import * as http from 'http';
 
-console.log(obj.type);  // => 'image/svg+xml'
-console.log(obj.parameters.charset);  // => 'utf-8'
+const mediaType = contentType.parse('image/svg+xml; charset=utf-8');
+mediaType; // $ExpectType ParsedMediaType
+mediaType.type; // $ExpectType string
+mediaType.parameters; // $ExpectType { [key: string]: string; }
 
-let req: express.Request;
-obj = contentType.parse(req);
+http.createServer((req, res) => {
+    contentType.parse(req);
+    contentType.parse(res);
+});
 
-let res: express.Response;
-obj = contentType.parse(res);
-
-let str: string = contentType.format({type: 'image/svg+xml'});
-
-let media: contentType.MediaType;
-contentType.format(media);
+// $ExpectType string
+contentType.format({type: 'image/svg+xml'});
+contentType.format({type: 'image/svg+xml', parameters: {charset: 'utf-8'}});
+contentType.format(mediaType);
diff --git a/types/content-type/index.d.ts b/types/content-type/index.d.ts
index ec60de446f..5ff4ae7ff1 100644
--- a/types/content-type/index.d.ts
+++ b/types/content-type/index.d.ts
@@ -1,21 +1,26 @@
 // Type definitions for content-type 1.1
 // Project: https://www.npmjs.com/package/content-type
 // Definitions by: Hiroki Horiuchi <https://github.com/horiuchi>
+//                 BendingBender <https://github.com/BendingBender>
 // Definitions: https://github.com/borisyankov/DefinitelyTyped
 
-import * as express from 'express';
+export function parse(input: RequestLike | ResponseLike | string): ParsedMediaType;
+export function format(obj: MediaType): string;
 
-declare var ct: ct.StaticFunctions;
-export = ct;
-
-declare namespace ct {
-    interface StaticFunctions {
-        parse(input: express.Request | express.Response | string): MediaType;
-        format(obj: MediaType): string;
-    }
-
-    interface MediaType {
-        type: string;
-        parameters?: any;
-    }
+export interface ParsedMediaType {
+    type: string;
+    parameters: {[key: string]: string};
+}
+
+export interface MediaType {
+    type: string;
+    parameters?: {[key: string]: string};
+}
+
+export interface RequestLike {
+    headers: {[header: string]: string | string[]};
+}
+
+export interface ResponseLike {
+    getHeader(name: string): number | string | string[] | undefined;
 }
diff --git a/types/content-type/tsconfig.json b/types/content-type/tsconfig.json
index 4eaa2f42f4..3361989225 100644
--- a/types/content-type/tsconfig.json
+++ b/types/content-type/tsconfig.json
@@ -6,7 +6,7 @@
         ],
         "noImplicitAny": true,
         "noImplicitThis": true,
-        "strictNullChecks": false,
+        "strictNullChecks": true,
         "baseUrl": "../",
         "typeRoots": [
             "../"
@@ -19,4 +19,4 @@
         "index.d.ts",
         "content-type-tests.ts"
     ]
-}
\ No newline at end of file
+}