diff --git a/aio/tools/transforms/angular-api-package/index.js b/aio/tools/transforms/angular-api-package/index.js
index 42d48c605e..1645490a01 100644
--- a/aio/tools/transforms/angular-api-package/index.js
+++ b/aio/tools/transforms/angular-api-package/index.js
@@ -86,6 +86,7 @@ module.exports = new Package('angular-api', [basePackage, typeScriptPackage])
       'common/http/testing/index.ts',
       'common/index.ts',
       'common/testing/index.ts',
+      'common/upgrade/index.ts',
       'core/index.ts',
       'core/testing/index.ts',
       'elements/index.ts',
diff --git a/tools/public_api_guard/common/upgrade.d.ts b/tools/public_api_guard/common/upgrade.d.ts
index 420eb3411e..4ea123fffa 100644
--- a/tools/public_api_guard/common/upgrade.d.ts
+++ b/tools/public_api_guard/common/upgrade.d.ts
@@ -35,7 +35,7 @@ export declare class $locationShimProvider {
 }
 
 export declare class AngularJSUrlCodec implements UrlCodec {
-    areEqual(a: string, b: string): boolean;
+    areEqual(valA: string, valB: string): boolean;
     decodeHash(hash: string): string;
     decodePath(path: string, html5Mode?: boolean): string;
     decodeSearch(search: string): {
@@ -77,7 +77,7 @@ export declare class LocationUpgradeModule {
 }
 
 export declare abstract class UrlCodec {
-    abstract areEqual(a: string, b: string): boolean;
+    abstract areEqual(valA: string, valB: string): boolean;
     abstract decodeHash(hash: string): string;
     abstract decodePath(path: string): string;
     abstract decodeSearch(search: string): {