diff --git a/tools/public_api_guard/core/index.d.ts b/tools/public_api_guard/core/index.d.ts
index c77e8b5255..895f05ce45 100644
--- a/tools/public_api_guard/core/index.d.ts
+++ b/tools/public_api_guard/core/index.d.ts
@@ -855,7 +855,7 @@ export declare class NgZoneError {
 
 /** @stable */
 export declare class NoAnnotationError extends BaseException {
-    constructor(typeOrFunc: any, params: any[][]);
+    constructor(typeOrFunc: Type | Function, params: any[][]);
 }
 
 /** @stable */
@@ -906,7 +906,7 @@ export interface OptionalMetadataFactory {
 
 /** @stable */
 export declare class OutOfBoundsError extends BaseException {
-    constructor(index: any);
+    constructor(index: number);
 }
 
 /** @stable */