diff --git a/packages/core/src/change_detection.ts b/packages/core/src/change_detection.ts
index d543d0826f..8fd31eb47b 100644
--- a/packages/core/src/change_detection.ts
+++ b/packages/core/src/change_detection.ts
@@ -12,4 +12,4 @@
  * Change detection enables data binding in Angular.
  */
 
-export {ChangeDetectionStrategy, ChangeDetectorRef, CollectionChangeRecord, DefaultIterableDiffer, IterableChangeRecord, IterableChanges, IterableDiffer, IterableDifferFactory, IterableDiffers, KeyValueChangeRecord, KeyValueChanges, KeyValueDiffer, KeyValueDifferFactory, KeyValueDiffers, NgIterable, PipeTransform, SimpleChange, SimpleChanges, TrackByFn, TrackByFunction, WrappedValue} from './change_detection/change_detection';
+export {ChangeDetectionStrategy, ChangeDetectorRef, CollectionChangeRecord, DefaultIterableDiffer, IterableChangeRecord, IterableChanges, IterableDiffer, IterableDifferFactory, IterableDiffers, KeyValueChangeRecord, KeyValueChanges, KeyValueDiffer, KeyValueDifferFactory, KeyValueDiffers, NgIterable, PipeTransform, SimpleChange, SimpleChanges, TrackByFunction, WrappedValue} from './change_detection/change_detection';
diff --git a/packages/core/src/change_detection/change_detection.ts b/packages/core/src/change_detection/change_detection.ts
index db43f81e07..5ad5ce00ad 100644
--- a/packages/core/src/change_detection/change_detection.ts
+++ b/packages/core/src/change_detection/change_detection.ts
@@ -18,7 +18,7 @@ export {ChangeDetectionStrategy, ChangeDetectorStatus, isDefaultChangeDetectionS
 export {DefaultIterableDifferFactory} from './differs/default_iterable_differ';
 export {DefaultIterableDiffer} from './differs/default_iterable_differ';
 export {DefaultKeyValueDifferFactory} from './differs/default_keyvalue_differ';
-export {CollectionChangeRecord, IterableChangeRecord, IterableChanges, IterableDiffer, IterableDifferFactory, IterableDiffers, NgIterable, TrackByFn, TrackByFunction} from './differs/iterable_differs';
+export {CollectionChangeRecord, IterableChangeRecord, IterableChanges, IterableDiffer, IterableDifferFactory, IterableDiffers, NgIterable, TrackByFunction} from './differs/iterable_differs';
 export {KeyValueChangeRecord, KeyValueChanges, KeyValueDiffer, KeyValueDifferFactory, KeyValueDiffers} from './differs/keyvalue_differs';
 export {PipeTransform} from './pipe_transform';
 
diff --git a/packages/core/src/change_detection/differs/iterable_differs.ts b/packages/core/src/change_detection/differs/iterable_differs.ts
index d1daadc3b5..6769731856 100644
--- a/packages/core/src/change_detection/differs/iterable_differs.ts
+++ b/packages/core/src/change_detection/differs/iterable_differs.ts
@@ -82,7 +82,8 @@ export interface IterableChanges<V> {
   /** Iterate over all removed items. */
   forEachRemovedItem(fn: (record: IterableChangeRecord<V>) => void): void;
 
-  /** Iterate over all items which had their identity (as computed by the `trackByFn`) changed. */
+  /** Iterate over all items which had their identity (as computed by the `TrackByFunction`)
+   * changed. */
   forEachIdentityChange(fn: (record: IterableChangeRecord<V>) => void): void;
 }
 
@@ -101,7 +102,7 @@ export interface IterableChangeRecord<V> {
   /** The item. */
   readonly item: V;
 
-  /** Track by identity as computed by the `trackByFn`. */
+  /** Track by identity as computed by the `TrackByFunction`. */
   readonly trackById: any;
 }
 
@@ -110,14 +111,6 @@ export interface IterableChangeRecord<V> {
  */
 export interface CollectionChangeRecord<V> extends IterableChangeRecord<V> {}
 
-
-/**
- * Nolonger used.
- *
- * @deprecated v4.0.0 - Use TrackByFunction instead
- */
-export interface TrackByFn { (index: number, item: any): any; }
-
 /**
  * An optional function passed into {@link NgForOf} that defines how to track
  * items in an iterable (e.g. fby index or id)
diff --git a/tools/public_api_guard/core/core.d.ts b/tools/public_api_guard/core/core.d.ts
index 7363e596d3..21d92db227 100644
--- a/tools/public_api_guard/core/core.d.ts
+++ b/tools/public_api_guard/core/core.d.ts
@@ -989,11 +989,6 @@ export declare class TestabilityRegistry {
     registerApplication(token: any, testability: Testability): void;
 }
 
-/** @deprecated */
-export interface TrackByFn {
-    (index: number, item: any): any;
-}
-
 /** @stable */
 export interface TrackByFunction<T> {
     (index: number, item: T): any;