diff --git a/packages/common/http/testing/test/request_spec.ts b/packages/common/http/testing/test/request_spec.ts
index ae1f1851f1..ee7ba15c6f 100644
--- a/packages/common/http/testing/test/request_spec.ts
+++ b/packages/common/http/testing/test/request_spec.ts
@@ -6,8 +6,6 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-/// <reference types="rxjs" />
-
 import {HttpClient} from '@angular/common/http';
 import {HttpClientTestingBackend} from '@angular/common/http/testing/src/backend';
 
diff --git a/packages/core/src/event_emitter.ts b/packages/core/src/event_emitter.ts
index c1a2bed99e..f662fe4763 100644
--- a/packages/core/src/event_emitter.ts
+++ b/packages/core/src/event_emitter.ts
@@ -6,6 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+/// <reference types="rxjs" />
+
 import {Subject, Subscription} from 'rxjs';
 
 /**
diff --git a/packages/core/test/render3/outputs_spec.ts b/packages/core/test/render3/outputs_spec.ts
index a6549afd84..4c32408009 100644
--- a/packages/core/test/render3/outputs_spec.ts
+++ b/packages/core/test/render3/outputs_spec.ts
@@ -6,8 +6,6 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-/// <reference types="rxjs" />
-
 import {EventEmitter} from '@angular/core';
 
 import {defineComponent, defineDirective} from '../../src/render3/index';
diff --git a/packages/core/test/render3/properties_spec.ts b/packages/core/test/render3/properties_spec.ts
index 629b5df250..808901d036 100644
--- a/packages/core/test/render3/properties_spec.ts
+++ b/packages/core/test/render3/properties_spec.ts
@@ -6,8 +6,6 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-/// <reference types="rxjs" />
-
 import {EventEmitter} from '@angular/core';
 
 import {defineComponent, defineDirective} from '../../src/render3/index';
diff --git a/packages/core/test/render3/query_spec.ts b/packages/core/test/render3/query_spec.ts
index 2f3b95c4e9..637ec8cf66 100644
--- a/packages/core/test/render3/query_spec.ts
+++ b/packages/core/test/render3/query_spec.ts
@@ -6,8 +6,6 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-/// <reference types="rxjs" />
-
 import {NgForOfContext} from '@angular/common';
 import {ElementRef, QueryList, TemplateRef, ViewContainerRef} from '@angular/core';