diff --git a/types/make-dir/index.d.ts b/types/make-dir/index.d.ts
index e23dfba939..905343c883 100644
--- a/types/make-dir/index.d.ts
+++ b/types/make-dir/index.d.ts
@@ -1,8 +1,12 @@
 // Type definitions for make-dir 1.0
 // Project: https://github.com/sindresorhus/make-dir
 // Definitions by: Ika <https://github.com/ikatyang>
+//                 BendingBender <https://github.com/BendingBender>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
+/// <reference types="node"/>
+import * as fs from 'fs';
+
 export = makeDir;
 
 /**
@@ -33,6 +37,6 @@ declare namespace makeDir {
          *
          * Use a custom `fs` implementation. For example [`graceful-fs`](https://github.com/isaacs/node-graceful-fs).
          */
-        fs?: any;
+        fs?: typeof fs;
     }
 }
diff --git a/types/make-dir/make-dir-tests.ts b/types/make-dir/make-dir-tests.ts
index 817d793b70..2767706bf6 100644
--- a/types/make-dir/make-dir-tests.ts
+++ b/types/make-dir/make-dir-tests.ts
@@ -1,7 +1,13 @@
 import makeDir = require('make-dir');
+import * as fs from 'fs';
+import * as gfs from 'graceful-fs';
 
 makeDir('path/to/somewhere').then(dirname => {
     // do something
 });
 
 const dirname = makeDir.sync('path/to/somewhere');
+
+makeDir('path/to/somewhere', {mode: parseInt('777', 8)});
+makeDir('path/to/somewhere', {fs});
+makeDir('path/to/somewhere', {fs: gfs});