diff --git a/modules/@angular/router/src/router.ts b/modules/@angular/router/src/router.ts
index e4f596e403..89b73fa604 100644
--- a/modules/@angular/router/src/router.ts
+++ b/modules/@angular/router/src/router.ts
@@ -320,9 +320,9 @@ class GuardChecks {
     return forkJoin(canActivate.map(c => {
       const guard = this.injector.get(c);
       if (guard.canActivate) {
-        return of(guard.canActivate(future, this.future));
+        return wrapIntoObservable(guard.canActivate(future, this.future));
       } else {
-        return of(guard(future, this.future));
+        return wrapIntoObservable(guard(future, this.future));
       }
     })).map(and);
   }
@@ -333,14 +333,22 @@ class GuardChecks {
     return forkJoin(canDeactivate.map(c => {
       const guard = this.injector.get(c);
       if (guard.canDeactivate) {
-        return of(guard.canDeactivate(component, curr, this.curr));
+        return wrapIntoObservable(guard.canDeactivate(component, curr, this.curr));
       } else {
-        return of(guard(component, curr, this.curr));
+        return wrapIntoObservable(guard(component, curr, this.curr));
       }
     })).map(and);
   }
 }
 
+function wrapIntoObservable<T>(value: T | Observable<T>): Observable<T> {
+  if (value instanceof Observable) {
+    return value;
+  } else {
+    return of(value);
+  }
+}
+
 class ActivateRoutes {
   constructor(private futureState: RouterState, private currState: RouterState) {}
 
diff --git a/modules/@angular/router/test/router.spec.ts b/modules/@angular/router/test/router.spec.ts
index 71fcd3c177..194ac9d362 100644
--- a/modules/@angular/router/test/router.spec.ts
+++ b/modules/@angular/router/test/router.spec.ts
@@ -21,6 +21,7 @@ import { UrlSerializer, DefaultUrlSerializer, RouterOutletMap, Router, Activated
  RouterStateSnapshot, ActivatedRouteSnapshot, CanActivate, CanDeactivate, Event, NavigationStart, NavigationEnd, NavigationCancel, NavigationError, RouterConfig } from '../src/index';
 import { Observable } from 'rxjs/Observable';
 import 'rxjs/add/operator/map';
+import {of} from 'rxjs/observable/of';
 
 describe("Integration", () => {
 
@@ -458,6 +459,28 @@ describe("Integration", () => {
             expect(location.path()).toEqual('/team/22');
           })));
       });
+
+      describe("should work when returns an observable", () => {
+        beforeEachProviders(() => [
+          {provide: 'CanActivate', useValue: (a:ActivatedRouteSnapshot, b:RouterStateSnapshot) => {
+            return of(false);
+          }}
+        ]);
+
+        it('works',
+          fakeAsync(inject([Router, TestComponentBuilder, Location], (router, tcb, location) => {
+            router.resetConfig([
+              { path: 'team/:id', component: TeamCmp, canActivate: ['CanActivate'] }
+            ]);
+
+            const fixture = tcb.createFakeAsync(RootCmp);
+            advance(fixture);
+
+            router.navigateByUrl('/team/22');
+            advance(fixture);
+            expect(location.path()).toEqual('');
+          })));
+       });
     });
 
     describe("CanDeactivate", () => {
@@ -515,11 +538,40 @@ describe("Integration", () => {
 
             router.navigateByUrl('/team/22');
             advance(fixture);
-
             expect(location.path()).toEqual('/team/22');
+
+            router.navigateByUrl('/team/33');
+            advance(fixture);
+            expect(location.path()).toEqual('/team/33');
           })));
       });
     });
+
+    describe("should work when returns an observable", () => {
+      beforeEachProviders(() => [
+        {provide: 'CanDeactivate', useValue: (c:TeamCmp, a:ActivatedRouteSnapshot, b:RouterStateSnapshot) => {
+          return of(false);
+        }}
+      ]);
+
+      it('works',
+        fakeAsync(inject([Router, TestComponentBuilder, Location], (router, tcb, location) => {
+          router.resetConfig([
+            { path: 'team/:id', component: TeamCmp, canDeactivate: ['CanDeactivate'] }
+          ]);
+
+          const fixture = tcb.createFakeAsync(RootCmp);
+          advance(fixture);
+
+          router.navigateByUrl('/team/22');
+          advance(fixture);
+          expect(location.path()).toEqual('/team/22');
+
+          router.navigateByUrl('/team/33');
+          advance(fixture);
+          expect(location.path()).toEqual('/team/22');
+        })));
+    });
   });
 });