diff --git a/aio/content/guide/http.md b/aio/content/guide/http.md
index 08e659155c..69278330e1 100644
--- a/aio/content/guide/http.md
+++ b/aio/content/guide/http.md
@@ -357,7 +357,7 @@ export class AuthInterceptor implements HttpInterceptor {
  
   intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
     // Get the auth header from the service.
-    const authHeader: this.auth.getAuthorizationHeader();
+    const authHeader = this.auth.getAuthorizationHeader();
     // Clone the request to add the new header.
     const authReq = req.clone({headers: req.headers.set('Authorization', authHeader)});
     // Pass on the cloned request instead of the original request.