diff --git a/modules/@angular/router/src/directives/router_link.ts b/modules/@angular/router/src/directives/router_link.ts
index a34b0610a9..c2278fd275 100644
--- a/modules/@angular/router/src/directives/router_link.ts
+++ b/modules/@angular/router/src/directives/router_link.ts
@@ -22,7 +22,7 @@ import {ObservableWrapper} from '../facade/async';
 @Directive({selector: '[routerLink]'})
 export class RouterLink implements OnDestroy {
   @Input() target: string;
-  private _changes: any[] = [];
+  private _comands: any[] = [];
   private _subscription: any;
 
   @HostBinding() private href: string;
@@ -37,21 +37,22 @@ export class RouterLink implements OnDestroy {
 
   @Input()
   set routerLink(data: any[]) {
-    this._changes = data;
+    this._comands = data;
     this._updateTargetUrlAndHref();
   }
 
+
   @HostListener("click")
   onClick(): boolean {
     if (!isString(this.target) || this.target == '_self') {
-      this._router.navigate(this._changes, this._routeSegment);
+      this._router.navigate(this._comands, this._routeSegment);
       return false;
     }
     return true;
   }
 
   private _updateTargetUrlAndHref(): void {
-    let tree = this._router.createUrlTree(this._changes, this._routeSegment);
+    let tree = this._router.createUrlTree(this._comands, this._routeSegment);
     if (isPresent(tree)) {
       this.href = this._router.serializeUrl(tree);
       this.isActive = this._router.urlTree.contains(tree);
diff --git a/modules/@angular/router/src/router.ts b/modules/@angular/router/src/router.ts
index 3a656c9baf..e729aaecc3 100644
--- a/modules/@angular/router/src/router.ts
+++ b/modules/@angular/router/src/router.ts
@@ -52,14 +52,14 @@ export class Router {
     return this._navigate(this._urlSerializer.parse(url));
   }
 
-  navigate(changes: any[], segment?: RouteSegment): Promise<void> {
-    return this._navigate(this.createUrlTree(changes, segment));
+  navigate(commands: any[], segment?: RouteSegment): Promise<void> {
+    return this._navigate(this.createUrlTree(commands, segment));
   }
 
   dispose(): void { ObservableWrapper.dispose(this._locationSubscription); }
 
   private _createInitialTree(): RouteTree {
-    let root = new RouteSegment([new UrlSegment("", null, null)], null, DEFAULT_OUTLET_NAME,
+    let root = new RouteSegment([new UrlSegment("", {}, null)], {}, DEFAULT_OUTLET_NAME,
                                 this._rootComponentType, null);
     return new RouteTree(new TreeNode<RouteSegment>(root, []));
   }
@@ -85,13 +85,9 @@ export class Router {
         });
   }
 
-  createUrlTree(changes: any[], segment?: RouteSegment): UrlTree {
-    if (isPresent(this._prevTree)) {
-      let s = isPresent(segment) ? segment : this._prevTree.root;
-      return link(s, this._prevTree, this.urlTree, changes);
-    } else {
-      return null;
-    }
+  createUrlTree(commands: any[], segment?: RouteSegment): UrlTree {
+    let s = isPresent(segment) ? segment : this._prevTree.root;
+    return link(s, this._prevTree, this.urlTree, commands);
   }
 
   serializeUrl(url: UrlTree): string { return this._urlSerializer.serialize(url); }