diff --git a/aio/src/app/app.component.spec.ts b/aio/src/app/app.component.spec.ts
index 62f345f85900f..ce1c4d75c3702 100644
--- a/aio/src/app/app.component.spec.ts
+++ b/aio/src/app/app.component.spec.ts
@@ -417,6 +417,15 @@ describe('AppComponent', () => {
         selectElement.triggerEventHandler('change', { option: versionWithoutUrl, index: versionWithoutUrlIndex });
         expect(locationService.go).not.toHaveBeenCalled();
       });
+
+      it('should navigate when change to a version with a url that does not end with `/`', async () => {
+        await setupSelectorForTesting();
+        locationService.urlSubject.next('docs#section-1');
+        const versionWithoutSlashIndex = component.docVersions.length;
+        const versionWithoutSlashUrl = component.docVersions[versionWithoutSlashIndex] = { url: 'https://next.angular.io', title: 'foo' };
+        selectElement.triggerEventHandler('change', { option: versionWithoutSlashUrl, index: versionWithoutSlashIndex });
+        expect(locationService.go).toHaveBeenCalledWith('https://next.angular.io/docs#section-1');
+      });
     });
 
     describe('currentDocument', () => {
diff --git a/aio/src/app/app.component.ts b/aio/src/app/app.component.ts
index b5fa56c11debc..bedd8046131fb 100644
--- a/aio/src/app/app.component.ts
+++ b/aio/src/app/app.component.ts
@@ -149,8 +149,8 @@ export class AppComponent implements OnInit {
     ]).subscribe(([versionInfo, versions]) => {
       // TODO(pbd): consider whether we can lookup the stable and next versions from the internet
       const computedVersions: NavigationNode[] = [
-        { title: 'next', url: 'https://next.angular.io' },
-        { title: 'stable', url: 'https://angular.io' },
+        { title: 'next', url: 'https://next.angular.io/' },
+        { title: 'stable', url: 'https://angular.io/' },
       ];
       if (this.deployment.mode === 'archive') {
         computedVersions.push({ title: `v${versionInfo.major}` });
@@ -232,7 +232,8 @@ export class AppComponent implements OnInit {
   onDocVersionChange(versionIndex: number) {
     const version = this.docVersions[versionIndex];
     if (version.url) {
-      this.locationService.go(`${version.url}${this.currentUrl}`);
+      const versionUrl = version.url  + (!version.url.endsWith('/') ? '/' : '');
+      this.locationService.go(`${versionUrl}${this.currentUrl}`);
     }
   }