diff --git a/packages/compiler-cli/src/ngtsc/testing/fake_common/index.ts b/packages/compiler-cli/src/ngtsc/testing/fake_common/index.ts
index da99030fb7..a7a3989e4a 100644
--- a/packages/compiler-cli/src/ngtsc/testing/fake_common/index.ts
+++ b/packages/compiler-cli/src/ngtsc/testing/fake_common/index.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {NgIterable, TemplateRef, ɵɵDirectiveDeclaration, ɵɵNgModuleDeclaration, ɵɵPipeDeclaration} from '@angular/core';
+import {NgIterable, TemplateRef, TrackByFunction, ɵɵDirectiveDeclaration, ɵɵNgModuleDeclaration, ɵɵPipeDeclaration} from '@angular/core';
 
 export interface NgForOfContext<T, U extends NgIterable<T>> {
   $implicit: T;
@@ -19,10 +19,6 @@ export interface NgForOfContext<T, U extends NgIterable<T>> {
   index: number;
 }
 
-export interface TrackByFunction<T> {
-  (index: number, item: T): any;
-}
-
 export interface NgIfContext<T = unknown> {
   $implicit: T;
   ngIf: T;
diff --git a/packages/compiler-cli/src/ngtsc/testing/fake_core/index.ts b/packages/compiler-cli/src/ngtsc/testing/fake_core/index.ts
index 35fe9a2575..7632c14450 100644
--- a/packages/compiler-cli/src/ngtsc/testing/fake_core/index.ts
+++ b/packages/compiler-cli/src/ngtsc/testing/fake_core/index.ts
@@ -114,3 +114,7 @@ export interface PipeTransform {
 export interface OnDestroy {
   ngOnDestroy(): void;
 }
+
+export interface TrackByFunction<T> {
+  (index: number, item: T): any;
+}