diff --git a/types/node/fs.d.ts b/types/node/fs.d.ts
index bb100fc831..b51679c876 100644
--- a/types/node/fs.d.ts
+++ b/types/node/fs.d.ts
@@ -858,7 +858,7 @@ declare module "fs" {
      * @param path A path to a file. If a URL is provided, it must use the `file:` protocol.
      * @param options If called with `withFileTypes: true` the result data will be an array of Dirent.
      */
-    function readdir(path: PathLike, options: { withFileTypes: true }, callback: (err: NodeJS.ErrnoException | null, files: Dirent[]) => void): void;
+    function readdir(path: PathLike, options: { encoding?: string | null; withFileTypes: true }, callback: (err: NodeJS.ErrnoException | null, files: Dirent[]) => void): void;
 
     // NOTE: This namespace provides design-time support for util.promisify. Exported members do not exist at runtime.
     namespace readdir {
@@ -888,7 +888,7 @@ declare module "fs" {
          * @param path A path to a file. If a URL is provided, it must use the `file:` protocol.
          * @param options If called with `withFileTypes: true` the result data will be an array of Dirent
          */
-        function __promisify__(path: PathLike, options: { withFileTypes: true }): Promise<Dirent[]>;
+        function __promisify__(path: PathLike, options: { encoding?: string | null; withFileTypes: true }): Promise<Dirent[]>;
     }
 
     /**
@@ -913,11 +913,11 @@ declare module "fs" {
     function readdirSync(path: PathLike, options?: { encoding?: string | null; withFileTypes?: false } | string | null): string[] | Buffer[];
 
     /**
-     * Asynchronous readdir(3) - read a directory.
+     * Synchronous readdir(3) - read a directory.
      * @param path A path to a file. If a URL is provided, it must use the `file:` protocol.
      * @param options If called with `withFileTypes: true` the result data will be an array of Dirent.
      */
-    function readdirSync(path: PathLike, options: { withFileTypes: true }): Dirent[];
+    function readdirSync(path: PathLike, options: { encoding?: string | null; withFileTypes: true }): Dirent[];
 
     /**
      * Asynchronous close(2) - close a file descriptor.
diff --git a/types/node/node-tests.ts b/types/node/node-tests.ts
index d5fe429815..2fb2ab24c8 100644
--- a/types/node/node-tests.ts
+++ b/types/node/node-tests.ts
@@ -109,6 +109,7 @@ import Module = require("module");
         listS = fs.readdirSync('path', undefined);
         const listDir: fs.Dirent[] = fs.readdirSync('path', { withFileTypes: true });
         const listDir2: Buffer[] = fs.readdirSync('path', { withFileTypes: false, encoding: 'buffer' });
+        const listDir3: fs.Dirent[] = fs.readdirSync('path', { encoding: 'utf8', withFileTypes: true });
 
         let listB: Buffer[];
         listB = fs.readdirSync('path', { encoding: 'buffer' });
@@ -120,6 +121,23 @@ import Module = require("module");
 
         fs.readdir('path', { withFileTypes: true }, (err: NodeJS.ErrnoException | null, files: fs.Dirent[]) => {});
     }
+
+    async function testPromisify() {
+        const rd = util.promisify(fs.readdir);
+        let listS: string[];
+        listS = await rd('path');
+        listS = await rd('path', 'utf8');
+        listS = await rd('path', null);
+        listS = await rd('path', undefined);
+        listS = await rd('path', { encoding: 'utf8' });
+        listS = await rd('path', { encoding: null });
+        listS = await rd('path', { encoding: null, withFileTypes: false });
+        listS = await rd('path', { encoding: 'utf8', withFileTypes: false });
+        const listDir: fs.Dirent[] = await rd('path', { withFileTypes: true });
+        const listDir2: Buffer[] = await rd('path', { withFileTypes: false, encoding: 'buffer' });
+        const listDir3: fs.Dirent[] = await rd('path', { encoding: 'utf8', withFileTypes: true });
+    }
+
     {
         fs.mkdtemp('/tmp/foo-', (err, folder) => {
             console.log(folder);
diff --git a/types/node/v10/fs.d.ts b/types/node/v10/fs.d.ts
index 90db179550..ee94a8af86 100644
--- a/types/node/v10/fs.d.ts
+++ b/types/node/v10/fs.d.ts
@@ -858,7 +858,7 @@ declare module "fs" {
      * @param path A path to a file. If a URL is provided, it must use the `file:` protocol.
      * @param options If called with `withFileTypes: true` the result data will be an array of Dirent.
      */
-    function readdir(path: PathLike, options: { withFileTypes: true }, callback: (err: NodeJS.ErrnoException | null, files: Dirent[]) => void): void;
+    function readdir(path: PathLike, options: { encoding?: string | null; withFileTypes: true }, callback: (err: NodeJS.ErrnoException | null, files: Dirent[]) => void): void;
 
     // NOTE: This namespace provides design-time support for util.promisify. Exported members do not exist at runtime.
     namespace readdir {
@@ -888,7 +888,7 @@ declare module "fs" {
          * @param path A path to a file. If a URL is provided, it must use the `file:` protocol.
          * @param options If called with `withFileTypes: true` the result data will be an array of Dirent
          */
-        function __promisify__(path: PathLike, options: { withFileTypes: true }): Promise<Dirent[]>;
+        function __promisify__(path: PathLike, options: { encoding?: string | null; withFileTypes: true }): Promise<Dirent[]>;
     }
 
     /**
@@ -913,11 +913,11 @@ declare module "fs" {
     function readdirSync(path: PathLike, options?: { encoding?: string | null; withFileTypes?: false } | string | null): string[] | Buffer[];
 
     /**
-     * Asynchronous readdir(3) - read a directory.
+     * Synchronous readdir(3) - read a directory.
      * @param path A path to a file. If a URL is provided, it must use the `file:` protocol.
      * @param options If called with `withFileTypes: true` the result data will be an array of Dirent.
      */
-    function readdirSync(path: PathLike, options: { withFileTypes: true }): Dirent[];
+    function readdirSync(path: PathLike, options: { encoding?: string | null; withFileTypes: true }): Dirent[];
 
     /**
      * Asynchronous close(2) - close a file descriptor.
diff --git a/types/node/v10/node-tests.ts b/types/node/v10/node-tests.ts
index 417689bc88..6c24482076 100644
--- a/types/node/v10/node-tests.ts
+++ b/types/node/v10/node-tests.ts
@@ -261,6 +261,7 @@ import { Buffer as ImportedBuffer, SlowBuffer as ImportedSlowBuffer, transcode,
         listS = fs.readdirSync('path', undefined);
         const listDir: fs.Dirent[] = fs.readdirSync('path', { withFileTypes: true });
         const listDir2: Buffer[] = fs.readdirSync('path', { withFileTypes: false, encoding: 'buffer' });
+        const listDir3: fs.Dirent[] = fs.readdirSync('path', { encoding: 'utf8', withFileTypes: true });
 
         let listB: Buffer[];
         listB = fs.readdirSync('path', { encoding: 'buffer' });
@@ -272,6 +273,23 @@ import { Buffer as ImportedBuffer, SlowBuffer as ImportedSlowBuffer, transcode,
 
         fs.readdir('path', { withFileTypes: true }, (err: NodeJS.ErrnoException, files: fs.Dirent[]) => {});
     }
+
+    async function testPromisify() {
+        const rd = util.promisify(fs.readdir);
+        let listS: string[];
+        listS = await rd('path');
+        listS = await rd('path', 'utf8');
+        listS = await rd('path', null);
+        listS = await rd('path', undefined);
+        listS = await rd('path', { encoding: 'utf8' });
+        listS = await rd('path', { encoding: null });
+        listS = await rd('path', { encoding: null, withFileTypes: false });
+        listS = await rd('path', { encoding: 'utf8', withFileTypes: false });
+        const listDir: fs.Dirent[] = await rd('path', { withFileTypes: true });
+        const listDir2: Buffer[] = await rd('path', { withFileTypes: false, encoding: 'buffer' });
+        const listDir3: fs.Dirent[] = await rd('path', { encoding: 'utf8', withFileTypes: true });
+    }
+
     {
         fs.mkdtemp('/tmp/foo-', (err, folder) => {
             console.log(folder);
diff --git a/types/node/v11/fs.d.ts b/types/node/v11/fs.d.ts
index bb100fc831..b51679c876 100644
--- a/types/node/v11/fs.d.ts
+++ b/types/node/v11/fs.d.ts
@@ -858,7 +858,7 @@ declare module "fs" {
      * @param path A path to a file. If a URL is provided, it must use the `file:` protocol.
      * @param options If called with `withFileTypes: true` the result data will be an array of Dirent.
      */
-    function readdir(path: PathLike, options: { withFileTypes: true }, callback: (err: NodeJS.ErrnoException | null, files: Dirent[]) => void): void;
+    function readdir(path: PathLike, options: { encoding?: string | null; withFileTypes: true }, callback: (err: NodeJS.ErrnoException | null, files: Dirent[]) => void): void;
 
     // NOTE: This namespace provides design-time support for util.promisify. Exported members do not exist at runtime.
     namespace readdir {
@@ -888,7 +888,7 @@ declare module "fs" {
          * @param path A path to a file. If a URL is provided, it must use the `file:` protocol.
          * @param options If called with `withFileTypes: true` the result data will be an array of Dirent
          */
-        function __promisify__(path: PathLike, options: { withFileTypes: true }): Promise<Dirent[]>;
+        function __promisify__(path: PathLike, options: { encoding?: string | null; withFileTypes: true }): Promise<Dirent[]>;
     }
 
     /**
@@ -913,11 +913,11 @@ declare module "fs" {
     function readdirSync(path: PathLike, options?: { encoding?: string | null; withFileTypes?: false } | string | null): string[] | Buffer[];
 
     /**
-     * Asynchronous readdir(3) - read a directory.
+     * Synchronous readdir(3) - read a directory.
      * @param path A path to a file. If a URL is provided, it must use the `file:` protocol.
      * @param options If called with `withFileTypes: true` the result data will be an array of Dirent.
      */
-    function readdirSync(path: PathLike, options: { withFileTypes: true }): Dirent[];
+    function readdirSync(path: PathLike, options: { encoding?: string | null; withFileTypes: true }): Dirent[];
 
     /**
      * Asynchronous close(2) - close a file descriptor.
diff --git a/types/node/v11/node-tests.ts b/types/node/v11/node-tests.ts
index d5fe429815..2fb2ab24c8 100644
--- a/types/node/v11/node-tests.ts
+++ b/types/node/v11/node-tests.ts
@@ -109,6 +109,7 @@ import Module = require("module");
         listS = fs.readdirSync('path', undefined);
         const listDir: fs.Dirent[] = fs.readdirSync('path', { withFileTypes: true });
         const listDir2: Buffer[] = fs.readdirSync('path', { withFileTypes: false, encoding: 'buffer' });
+        const listDir3: fs.Dirent[] = fs.readdirSync('path', { encoding: 'utf8', withFileTypes: true });
 
         let listB: Buffer[];
         listB = fs.readdirSync('path', { encoding: 'buffer' });
@@ -120,6 +121,23 @@ import Module = require("module");
 
         fs.readdir('path', { withFileTypes: true }, (err: NodeJS.ErrnoException | null, files: fs.Dirent[]) => {});
     }
+
+    async function testPromisify() {
+        const rd = util.promisify(fs.readdir);
+        let listS: string[];
+        listS = await rd('path');
+        listS = await rd('path', 'utf8');
+        listS = await rd('path', null);
+        listS = await rd('path', undefined);
+        listS = await rd('path', { encoding: 'utf8' });
+        listS = await rd('path', { encoding: null });
+        listS = await rd('path', { encoding: null, withFileTypes: false });
+        listS = await rd('path', { encoding: 'utf8', withFileTypes: false });
+        const listDir: fs.Dirent[] = await rd('path', { withFileTypes: true });
+        const listDir2: Buffer[] = await rd('path', { withFileTypes: false, encoding: 'buffer' });
+        const listDir3: fs.Dirent[] = await rd('path', { encoding: 'utf8', withFileTypes: true });
+    }
+
     {
         fs.mkdtemp('/tmp/foo-', (err, folder) => {
             console.log(folder);