diff --git a/types/node/index.d.ts b/types/node/index.d.ts
index 6d67cb857a..016be4da20 100644
--- a/types/node/index.d.ts
+++ b/types/node/index.d.ts
@@ -2836,13 +2836,17 @@ declare module "fs" {
      */
     export function readFileSync(filename: string, options?: { flag?: string; }): Buffer;
     export function writeFile(filename: string, data: any, callback?: (err: NodeJS.ErrnoException) => void): void;
+    export function writeFile(filename: string, data: any, encoding: string, callback: (err: NodeJS.ErrnoException) => void): void;
     export function writeFile(filename: string, data: any, options: { encoding?: string; mode?: number; flag?: string; }, callback?: (err: NodeJS.ErrnoException) => void): void;
     export function writeFile(filename: string, data: any, options: { encoding?: string; mode?: string; flag?: string; }, callback?: (err: NodeJS.ErrnoException) => void): void;
+    export function writeFileSync(filename: string, data: any, encoding: string): void;
     export function writeFileSync(filename: string, data: any, options?: { encoding?: string; mode?: number; flag?: string; }): void;
     export function writeFileSync(filename: string, data: any, options?: { encoding?: string; mode?: string; flag?: string; }): void;
+    export function appendFile(filename: string, data: any, encoding: string, callback: (err: NodeJS.ErrnoException) => void): void;
     export function appendFile(filename: string, data: any, options: { encoding?: string; mode?: number; flag?: string; }, callback?: (err: NodeJS.ErrnoException) => void): void;
     export function appendFile(filename: string, data: any, options: { encoding?: string; mode?: string; flag?: string; }, callback?: (err: NodeJS.ErrnoException) => void): void;
     export function appendFile(filename: string, data: any, callback?: (err: NodeJS.ErrnoException) => void): void;
+    export function appendFileSync(filename: string, data: any, encoding: string): void;
     export function appendFileSync(filename: string, data: any, options?: { encoding?: string; mode?: number; flag?: string; }): void;
     export function appendFileSync(filename: string, data: any, options?: { encoding?: string; mode?: string; flag?: string; }): void;
     export function watchFile(filename: string, listener: (curr: Stats, prev: Stats) => void): void;
diff --git a/types/node/node-tests.ts b/types/node/node-tests.ts
index 3bb2ddcc69..869bde66dd 100644
--- a/types/node/node-tests.ts
+++ b/types/node/node-tests.ts
@@ -169,6 +169,18 @@ namespace fs_tests {
                 encoding: "ascii"
             },
             assert.ifError);
+
+        fs.writeFile("testfile", "content", "utf8", assert.ifError);
+
+        fs.writeFileSync("testfile", "content", "utf8");
+        fs.writeFileSync("testfile", "content", { encoding: "utf8" });
+    }
+
+    {
+        fs.appendFile("testfile", "foobar", "utf8", assert.ifError);
+        fs.appendFile("testfile", "foobar", { encoding: "utf8" }, assert.ifError);
+        fs.appendFileSync("testfile", "foobar", "utf8");
+        fs.appendFileSync("testfile", "foobar", { encoding: "utf8" });
     }
 
     {
diff --git a/types/node/v0/node-tests.ts b/types/node/v0/node-tests.ts
index 30dfd2bd72..57019bfe86 100644
--- a/types/node/v0/node-tests.ts
+++ b/types/node/v0/node-tests.ts
@@ -47,6 +47,11 @@ fs.writeFile("Harry Potter",
     },
     assert.ifError);
 
+fs.writeFileSync("testfile", "content", { encoding: "utf8" });
+
+fs.appendFile("testfile", "foobar", { encoding: "utf8" }, assert.ifError);
+fs.appendFileSync("testfile", "foobar", { encoding: "utf8" });
+
 var content: string,
     buffer: Buffer;
 
diff --git a/types/node/v4/index.d.ts b/types/node/v4/index.d.ts
index 3c5a7745e9..a79f49e35d 100644
--- a/types/node/v4/index.d.ts
+++ b/types/node/v4/index.d.ts
@@ -1773,13 +1773,17 @@ declare module "fs" {
      */
     export function readFileSync(filename: string, options?: { flag?: string; }): Buffer;
     export function writeFile(filename: string, data: any, callback?: (err: NodeJS.ErrnoException) => void): void;
+    export function writeFile(filename: string, data: any, encoding: string, callback: (err: NodeJS.ErrnoException) => void): void;
     export function writeFile(filename: string, data: any, options: { encoding?: string; mode?: number; flag?: string; }, callback?: (err: NodeJS.ErrnoException) => void): void;
     export function writeFile(filename: string, data: any, options: { encoding?: string; mode?: string; flag?: string; }, callback?: (err: NodeJS.ErrnoException) => void): void;
+    export function writeFileSync(filename: string, data: any, encoding: string): void;
     export function writeFileSync(filename: string, data: any, options?: { encoding?: string; mode?: number; flag?: string; }): void;
     export function writeFileSync(filename: string, data: any, options?: { encoding?: string; mode?: string; flag?: string; }): void;
+    export function appendFile(filename: string, data: any, encoding: string, callback: (err: NodeJS.ErrnoException) => void): void;
     export function appendFile(filename: string, data: any, options: { encoding?: string; mode?: number; flag?: string; }, callback?: (err: NodeJS.ErrnoException) => void): void;
     export function appendFile(filename: string, data: any, options: { encoding?: string; mode?: string; flag?: string; }, callback?: (err: NodeJS.ErrnoException) => void): void;
     export function appendFile(filename: string, data: any, callback?: (err: NodeJS.ErrnoException) => void): void;
+    export function appendFileSync(filename: string, data: any, encoding: string): void;
     export function appendFileSync(filename: string, data: any, options?: { encoding?: string; mode?: number; flag?: string; }): void;
     export function appendFileSync(filename: string, data: any, options?: { encoding?: string; mode?: string; flag?: string; }): void;
     export function watchFile(filename: string, listener: (curr: Stats, prev: Stats) => void): void;
diff --git a/types/node/v4/node-tests.ts b/types/node/v4/node-tests.ts
index b56bb224e1..a3e1cca18a 100644
--- a/types/node/v4/node-tests.ts
+++ b/types/node/v4/node-tests.ts
@@ -151,6 +151,18 @@ namespace fs_tests {
                 encoding: "ascii"
             },
             assert.ifError);
+
+        fs.writeFile("testfile", "content", "utf8", assert.ifError);
+
+        fs.writeFileSync("testfile", "content", "utf8");
+        fs.writeFileSync("testfile", "content", { encoding: "utf8" });
+    }
+
+    {
+        fs.appendFile("testfile", "foobar", "utf8", assert.ifError);
+        fs.appendFile("testfile", "foobar", { encoding: "utf8" }, assert.ifError);
+        fs.appendFileSync("testfile", "foobar", "utf8");
+        fs.appendFileSync("testfile", "foobar", { encoding: "utf8" });
     }
 
     {
diff --git a/types/node/v6/index.d.ts b/types/node/v6/index.d.ts
index d0c3a44311..b71a70e537 100644
--- a/types/node/v6/index.d.ts
+++ b/types/node/v6/index.d.ts
@@ -2562,13 +2562,17 @@ declare module "fs" {
      */
     export function readFileSync(filename: string, options?: { flag?: string; }): Buffer;
     export function writeFile(filename: string, data: any, callback?: (err: NodeJS.ErrnoException) => void): void;
+    export function writeFile(filename: string, data: any, encoding: string, callback: (err: NodeJS.ErrnoException) => void): void;
     export function writeFile(filename: string, data: any, options: { encoding?: string; mode?: number; flag?: string; }, callback?: (err: NodeJS.ErrnoException) => void): void;
     export function writeFile(filename: string, data: any, options: { encoding?: string; mode?: string; flag?: string; }, callback?: (err: NodeJS.ErrnoException) => void): void;
+    export function writeFileSync(filename: string, data: any, encoding: string): void;
     export function writeFileSync(filename: string, data: any, options?: { encoding?: string; mode?: number; flag?: string; }): void;
     export function writeFileSync(filename: string, data: any, options?: { encoding?: string; mode?: string; flag?: string; }): void;
+    export function appendFile(filename: string, data: any, encoding: string, callback: (err: NodeJS.ErrnoException) => void): void;
     export function appendFile(filename: string, data: any, options: { encoding?: string; mode?: number; flag?: string; }, callback?: (err: NodeJS.ErrnoException) => void): void;
     export function appendFile(filename: string, data: any, options: { encoding?: string; mode?: string; flag?: string; }, callback?: (err: NodeJS.ErrnoException) => void): void;
     export function appendFile(filename: string, data: any, callback?: (err: NodeJS.ErrnoException) => void): void;
+    export function appendFileSync(filename: string, data: any, encoding: string): void;
     export function appendFileSync(filename: string, data: any, options?: { encoding?: string; mode?: number; flag?: string; }): void;
     export function appendFileSync(filename: string, data: any, options?: { encoding?: string; mode?: string; flag?: string; }): void;
     export function watchFile(filename: string, listener: (curr: Stats, prev: Stats) => void): void;
diff --git a/types/node/v6/node-tests.ts b/types/node/v6/node-tests.ts
index f7474844e8..191f1128c2 100644
--- a/types/node/v6/node-tests.ts
+++ b/types/node/v6/node-tests.ts
@@ -168,6 +168,18 @@ namespace fs_tests {
                 encoding: "ascii"
             },
             assert.ifError);
+
+        fs.writeFile("testfile", "content", "utf8", assert.ifError);
+
+        fs.writeFileSync("testfile", "content", "utf8");
+        fs.writeFileSync("testfile", "content", { encoding: "utf8" });
+    }
+
+    {
+        fs.appendFile("testfile", "foobar", "utf8", assert.ifError);
+        fs.appendFile("testfile", "foobar", { encoding: "utf8" }, assert.ifError);
+        fs.appendFileSync("testfile", "foobar", "utf8");
+        fs.appendFileSync("testfile", "foobar", { encoding: "utf8" });
     }
 
     {
diff --git a/types/node/v7/index.d.ts b/types/node/v7/index.d.ts
index 31e068cec8..f075587a95 100644
--- a/types/node/v7/index.d.ts
+++ b/types/node/v7/index.d.ts
@@ -2691,13 +2691,17 @@ declare module "fs" {
      */
     export function readFileSync(filename: string, options?: { flag?: string; }): Buffer;
     export function writeFile(filename: string, data: any, callback?: (err: NodeJS.ErrnoException) => void): void;
+    export function writeFile(filename: string, data: any, encoding: string, callback: (err: NodeJS.ErrnoException) => void): void;
     export function writeFile(filename: string, data: any, options: { encoding?: string; mode?: number; flag?: string; }, callback?: (err: NodeJS.ErrnoException) => void): void;
     export function writeFile(filename: string, data: any, options: { encoding?: string; mode?: string; flag?: string; }, callback?: (err: NodeJS.ErrnoException) => void): void;
+    export function writeFileSync(filename: string, data: any, encoding: string): void;
     export function writeFileSync(filename: string, data: any, options?: { encoding?: string; mode?: number; flag?: string; }): void;
     export function writeFileSync(filename: string, data: any, options?: { encoding?: string; mode?: string; flag?: string; }): void;
+    export function appendFile(filename: string, data: any, encoding: string, callback: (err: NodeJS.ErrnoException) => void): void;
     export function appendFile(filename: string, data: any, options: { encoding?: string; mode?: number; flag?: string; }, callback?: (err: NodeJS.ErrnoException) => void): void;
     export function appendFile(filename: string, data: any, options: { encoding?: string; mode?: string; flag?: string; }, callback?: (err: NodeJS.ErrnoException) => void): void;
     export function appendFile(filename: string, data: any, callback?: (err: NodeJS.ErrnoException) => void): void;
+    export function appendFileSync(filename: string, data: any, encoding: string): void;
     export function appendFileSync(filename: string, data: any, options?: { encoding?: string; mode?: number; flag?: string; }): void;
     export function appendFileSync(filename: string, data: any, options?: { encoding?: string; mode?: string; flag?: string; }): void;
     export function watchFile(filename: string, listener: (curr: Stats, prev: Stats) => void): void;
diff --git a/types/node/v7/node-tests.ts b/types/node/v7/node-tests.ts
index de401eb0fc..4a2f53ab67 100644
--- a/types/node/v7/node-tests.ts
+++ b/types/node/v7/node-tests.ts
@@ -169,6 +169,18 @@ namespace fs_tests {
                 encoding: "ascii"
             },
             assert.ifError);
+
+        fs.writeFile("testfile", "content", "utf8", assert.ifError);
+
+        fs.writeFileSync("testfile", "content", "utf8");
+        fs.writeFileSync("testfile", "content", { encoding: "utf8" });
+    }
+
+    {
+        fs.appendFile("testfile", "foobar", "utf8", assert.ifError);
+        fs.appendFile("testfile", "foobar", { encoding: "utf8" }, assert.ifError);
+        fs.appendFileSync("testfile", "foobar", "utf8");
+        fs.appendFileSync("testfile", "foobar", { encoding: "utf8" });
     }
 
     {