diff --git a/modules/@angular/core/src/metadata/directives.ts b/modules/@angular/core/src/metadata/directives.ts
index dbc6c5994b..79169bbe80 100644
--- a/modules/@angular/core/src/metadata/directives.ts
+++ b/modules/@angular/core/src/metadata/directives.ts
@@ -1100,7 +1100,7 @@ export interface PipeDecorator {
  * @stable
  */
 export interface Pipe {
-  name?: string;
+  name: string;
   pure?: boolean;
 }