diff --git a/gulp-protractor/gulp-protractor.d.ts b/gulp-protractor/gulp-protractor.d.ts
index 4ac814780..fd98dbd43 100644
--- a/gulp-protractor/gulp-protractor.d.ts
+++ b/gulp-protractor/gulp-protractor.d.ts
@@ -18,8 +18,8 @@ declare module 'gulp-protractor' {
     interface IGulpProtractor {
         getProtractorDir(): string;
         protractor(options?: IOptions): NodeJS.ReadWriteStream;
-        webdriver_standalone: gulp.ITaskCallback;
-        webdriver_update: gulp.ITaskCallback;
+        webdriver_standalone: gulp.TaskCallback;
+        webdriver_update: gulp.TaskCallback;
     }
 
     var protractor: IGulpProtractor;
diff --git a/gulp-tsd/gulp-tsd.d.ts b/gulp-tsd/gulp-tsd.d.ts
index 20d279329..816d50d25 100644
--- a/gulp-tsd/gulp-tsd.d.ts
+++ b/gulp-tsd/gulp-tsd.d.ts
@@ -16,7 +16,7 @@ declare module "gulp-tsd" {
         opts?: Object;
     }
 
-    function tsd(opts?: IOptions, callback?: gulp.ITaskCallback): NodeJS.ReadWriteStream;
+    function tsd(opts?: IOptions, callback?: gulp.TaskCallback): NodeJS.ReadWriteStream;
 
     export = tsd;
 }
diff --git a/gulp/gulp-tests.ts b/gulp/gulp-tests.ts
index 2a69d40ca..d00690881 100644
--- a/gulp/gulp-tests.ts
+++ b/gulp/gulp-tests.ts
@@ -4,8 +4,8 @@
 import gulp = require("gulp");
 import browserSync = require("browser-sync");
 
-var typescript: gulp.IGulpPlugin = null; // this would be the TypeScript compiler
-var jasmine: gulp.IGulpPlugin = null; // this would be the jasmine test runner
+var typescript: gulp.GulpPlugin = null; // this would be the TypeScript compiler
+var jasmine: gulp.GulpPlugin = null; // this would be the jasmine test runner
 
 gulp.task('compile', function()
 {
diff --git a/gulp/gulp.d.ts b/gulp/gulp.d.ts
index abb8978d1..160ee99ce 100644
--- a/gulp/gulp.d.ts
+++ b/gulp/gulp.d.ts
@@ -46,7 +46,7 @@ declare module "gulp" {
             watch: WatchMethod;
         }
 
-        interface IGulpPlugin {
+        interface GulpPlugin {
             (...args: any[]): NodeJS.ReadWriteStream;
         }
 
@@ -57,14 +57,14 @@ declare module "gulp" {
              * @param glob a single glob or array of globs that indicate which files to watch for changes.
              * @param fn a callback or array of callbacks to be called on each change, or names of task(s) to run when a file changes, added with task().
              */
-            (glob: string|string[], fn: (IWatchCallback|string)): NodeJS.EventEmitter;
+            (glob: string|string[], fn: (WatchCallback|string)): NodeJS.EventEmitter;
             /**
              * Watch files and do something when a file changes. This always returns an EventEmitter that emits change events.
              *
              * @param glob a single glob or array of globs that indicate which files to watch for changes.
              * @param fn a callback or array of callbacks to be called on each change, or names of task(s) to run when a file changes, added with task().
              */
-            (glob: string|string[], fn: (IWatchCallback|string)[]): NodeJS.EventEmitter;
+            (glob: string|string[], fn: (WatchCallback|string)[]): NodeJS.EventEmitter;
             /**
              * Watch files and do something when a file changes. This always returns an EventEmitter that emits change events.
              *
@@ -72,7 +72,7 @@ declare module "gulp" {
              * @param opt options, that are passed to the gaze library.
              * @param fn a callback or array of callbacks to be called on each change, or names of task(s) to run when a file changes, added with task().
              */
-            (glob: string|string[], opt: IWatchOptions, fn: (IWatchCallback|string)): NodeJS.EventEmitter;
+            (glob: string|string[], opt: WatchOptions, fn: (WatchCallback|string)): NodeJS.EventEmitter;
             /**
              * Watch files and do something when a file changes. This always returns an EventEmitter that emits change events.
              *
@@ -80,7 +80,7 @@ declare module "gulp" {
              * @param opt options, that are passed to the gaze library.
              * @param fn a callback or array of callbacks to be called on each change, or names of task(s) to run when a file changes, added with task().
              */
-            (glob: string|string[], opt: IWatchOptions, fn: (IWatchCallback|string)[]): NodeJS.EventEmitter;
+            (glob: string|string[], opt: WatchOptions, fn: (WatchCallback|string)[]): NodeJS.EventEmitter;
 
         }
 
@@ -92,7 +92,7 @@ declare module "gulp" {
              * @param outFolder The path (output folder) to write files to. Or a function that returns it, the function will be provided a vinyl File instance.
              * @param opt
              */
-            (outFolder: string|((file:string)=>string), opt?: IDestOptions): NodeJS.ReadWriteStream;
+            (outFolder: string|((file: string) => string), opt?: DestOptions): NodeJS.ReadWriteStream;
         }
 
         interface SrcMethod {
@@ -101,7 +101,7 @@ declare module "gulp" {
              * @param glob Glob or array of globs to read.
              * @param opt Options to pass to node-glob through glob-stream.
              */
-            (glob: string|string[], opt?: ISrcOptions): NodeJS.ReadWriteStream;
+            (glob: string|string[], opt?: SrcOptions): NodeJS.ReadWriteStream;
         }
 
         /**
@@ -109,7 +109,7 @@ declare module "gulp" {
          * Specifies two options in addition to those used by node-glob:
          * https://github.com/isaacs/node-glob#options
          */
-        interface ISrcOptions {
+        interface SrcOptions {
             /**
              * Setting this to <code>false</code> will return <code>file.contents</code> as <code>null</code>
              * and not read the file at all.
@@ -231,7 +231,7 @@ declare module "gulp" {
             globDebug?: boolean;
         }
 
-        interface IDestOptions {
+        interface DestOptions {
             /**
              * The output folder. Only has an effect if provided output folder is relative.
              * Default: process.cwd()
@@ -249,7 +249,7 @@ declare module "gulp" {
          * Options that are passed to <code>gaze</code>.
          * https://github.com/shama/gaze
          */
-        interface IWatchOptions {
+        interface WatchOptions {
             /** Interval to pass to fs.watchFile. */
             interval?: number;
             /** Delay for events called in succession for the same file/event. */
@@ -260,7 +260,7 @@ declare module "gulp" {
             cwd?: string;
         }
 
-        interface IWatchEvent {
+        interface WatchEvent {
             /** The type of change that occurred, either added, changed or deleted. */
             type: string;
             /** The path to the file that triggered the event. */
@@ -270,17 +270,17 @@ declare module "gulp" {
         /**
          * Callback to be called on each watched file change.
          */
-        interface IWatchCallback {
-            (event:IWatchEvent): void;
+        interface WatchCallback {
+            (event: WatchEvent): void;
         }
 
-        interface ITaskCallback {
+        interface TaskCallback {
             /**
              * Defines a task.
              * Tasks may be made asynchronous if they are passing a callback or return a promise or a stream.
              * @param cb callback used to signal asynchronous completion. Caller includes <code>err</code> in case of error.
              */
-            (cb?:(err?:any)=>void): any;
+            (cb?: (err?: any) => void): any;
         }
     }
 
diff --git a/run-sequence/run-sequence.d.ts b/run-sequence/run-sequence.d.ts
index 221ff270e..4507e80c0 100644
--- a/run-sequence/run-sequence.d.ts
+++ b/run-sequence/run-sequence.d.ts
@@ -10,7 +10,7 @@ declare module "run-sequence" {
     import gulp = require('gulp');
 
     interface IRunSequence {
-        (...streams: (string | string[] | gulp.ITaskCallback)[]): NodeJS.ReadWriteStream;
+        (...streams: (string | string[] | gulp.TaskCallback)[]): NodeJS.ReadWriteStream;
 
         use(gulp: gulp.Gulp): IRunSequence;
     }