Uncaught Error: Unexpected value 'HttpClient'

Estou seguindo as aulas passo a passo. E acredito ter feito tudo certo. Não dá nenhum erro de compilação no meu VSCode. Mas eu recebo o seguinte erro no console do browser:

Uncaught Error: Unexpected value 'HttpClient' imported by the module 'PhotosModule'. Please add a @NgModule annotation.

o código do meu photos.module.ts:

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { HttpClient } from '@angular/common/http';

import { PhotoComponent } from './photo/photo.component';
import { PhotoListComponent } from './photo-list/photo-list.component';
import { PhotoFormComponent } from './photo-form/photo-form.component';

@NgModule({
    declarations: [ PhotoComponent, PhotoListComponent, PhotoFormComponent ],
    imports: [HttpClient, CommonModule]
})
export class PhotosModule {}