diff --git a/scroller/easyscroller.d.ts b/scroller/easyscroller.d.ts
index 5b6477fe5..edc3c55d6 100644
--- a/scroller/easyscroller.d.ts
+++ b/scroller/easyscroller.d.ts
@@ -6,7 +6,7 @@
 
 /// <reference path="scroller.d.ts"/>
 
-class EasyScroller  {
+declare class EasyScroller  {
     constructor (content: any, options: ScrollerOptions);
 
     render(): void;
diff --git a/scroller/scroller-tests.ts b/scroller/scroller-tests.ts
index ff12a8639..941e05ff1 100644
--- a/scroller/scroller-tests.ts
+++ b/scroller/scroller-tests.ts
@@ -41,7 +41,7 @@ function test_canvas() {
 function test_domlist() {
     var container = document.getElementById("container");
     var content = document.getElementById("content");
-    var refreshElem = <HTMLCanvasElement>content.getElementsByTagName("div")[0];
+    var refreshElem = content.getElementsByTagName("div")[0];
     var scroller = new Scroller(render, {
         scrollingX: false
     });
diff --git a/scroller/scroller.d.ts b/scroller/scroller.d.ts
index 72bf30d2f..b1e439b0a 100644
--- a/scroller/scroller.d.ts
+++ b/scroller/scroller.d.ts
@@ -28,7 +28,7 @@ interface ScrollValuesWithZoom extends ScrollValues {
     zoom: number;
 }
 
-class Scroller {
+declare class Scroller {
     constructor (callback: (left: number, top: number, zoom: number) => void , options: ScrollerOptions);
 
     setDimensions(clientWidth: number, clientHeight: number, contentWidth: number, contentHeight: number): void;
diff --git a/soundjs/soundjs.d.ts b/soundjs/soundjs.d.ts
index a00d33775..24eeb0139 100644
--- a/soundjs/soundjs.d.ts
+++ b/soundjs/soundjs.d.ts
@@ -10,7 +10,7 @@
     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
-module createjs {
+declare module createjs {
     export class FlashPlugin {
         // properties
         static BASE_PATH: string;
diff --git a/youtube/youtube.d.ts b/youtube/youtube.d.ts
index 98e2334f1..fa74be939 100644
--- a/youtube/youtube.d.ts
+++ b/youtube/youtube.d.ts
@@ -4,7 +4,7 @@
 // Updated by: Ian Obermiller <http://ianobermiller.com>
 // Definitions: https://github.com/borisyankov/DefinitelyTyped
 
-module YT {
+declare module YT {
     interface EventArgs {
         target: Player;
         data: any;
@@ -148,5 +148,5 @@ module YT {
         ENDED,
         PAUSED,
         PLAYING
-    };
+    }
 }