diff --git a/modules/@angular/router/src/url_tree.ts b/modules/@angular/router/src/url_tree.ts
index 175d96c756..fef13c0412 100644
--- a/modules/@angular/router/src/url_tree.ts
+++ b/modules/@angular/router/src/url_tree.ts
@@ -294,7 +294,7 @@ class UrlParser {
       this.capture('/');
     }
 
-    if (this.remaining === '' || this.remaining.startsWith('?')) {
+    if (this.remaining === '' || this.remaining.startsWith('?') || this.remaining.startsWith('#')) {
       return new UrlSegment([], {});
     } else {
       return new UrlSegment([], this.parseSegmentChildren());
diff --git a/modules/@angular/router/test/router.spec.ts b/modules/@angular/router/test/router.spec.ts
index d6b632ee81..948b65cb1b 100644
--- a/modules/@angular/router/test/router.spec.ts
+++ b/modules/@angular/router/test/router.spec.ts
@@ -1226,35 +1226,34 @@ describe('Integration', () => {
 
 
     it('should set the class on a parent element when the link is active',
-        fakeAsync(inject(
-            [Router, TestComponentBuilder, Location],
-            (router: Router, tcb: TestComponentBuilder, location: Location) => {
-              const fixture = createRoot(tcb, router, RootCmp);
+       fakeAsync(inject(
+           [Router, TestComponentBuilder, Location],
+           (router: Router, tcb: TestComponentBuilder, location: Location) => {
+             const fixture = createRoot(tcb, router, RootCmp);
 
-              router.resetConfig([{
-                path: 'team/:id',
-                component: TeamCmp,
-                children: [{
-                  path: 'link',
-                  component: DummyLinkWithParentCmp,
-                  children: [
-                    {path: 'simple', component: SimpleCmp}, {path: '', component: BlankCmp}
-                  ]
-                }]
-              }]);
+             router.resetConfig([{
+               path: 'team/:id',
+               component: TeamCmp,
+               children: [{
+                 path: 'link',
+                 component: DummyLinkWithParentCmp,
+                 children:
+                     [{path: 'simple', component: SimpleCmp}, {path: '', component: BlankCmp}]
+               }]
+             }]);
 
-              router.navigateByUrl('/team/22/link;exact=true');
-              advance(fixture);
-              expect(location.path()).toEqual('/team/22/link;exact=true');
+             router.navigateByUrl('/team/22/link;exact=true');
+             advance(fixture);
+             expect(location.path()).toEqual('/team/22/link;exact=true');
 
-              const native = fixture.debugElement.nativeElement.querySelector('link-parent');
-              expect(native.className).toEqual('active');
+             const native = fixture.debugElement.nativeElement.querySelector('link-parent');
+             expect(native.className).toEqual('active');
 
-              router.navigateByUrl('/team/22/link/simple');
-              advance(fixture);
-              expect(location.path()).toEqual('/team/22/link/simple');
-              expect(native.className).toEqual('');
-            })));
+             router.navigateByUrl('/team/22/link/simple');
+             advance(fixture);
+             expect(location.path()).toEqual('/team/22/link/simple');
+             expect(native.className).toEqual('');
+           })));
 
     it('should set the class when the link is active',
        fakeAsync(inject(
diff --git a/modules/@angular/router/test/url_serializer.spec.ts b/modules/@angular/router/test/url_serializer.spec.ts
index 3fc810b209..2204c3e7d9 100644
--- a/modules/@angular/router/test/url_serializer.spec.ts
+++ b/modules/@angular/router/test/url_serializer.spec.ts
@@ -156,6 +156,11 @@ describe('url serializer', () => {
     expect(url.serialize(tree)).toEqual('/one#two');
   });
 
+  it('should parse fragment (root)', () => {
+    const tree = url.parse('/#one');
+    expectSegment(tree.root, '');
+    expect(url.serialize(tree)).toEqual('/#one');
+  });
 
   it('should parse empty fragment', () => {
     const tree = url.parse('/one#');