diff --git a/aio/content/examples/form-validation/src/app/shared/identity-revealed.directive.ts b/aio/content/examples/form-validation/src/app/shared/identity-revealed.directive.ts
index a13278295b..3c10d241a8 100644
--- a/aio/content/examples/form-validation/src/app/shared/identity-revealed.directive.ts
+++ b/aio/content/examples/form-validation/src/app/shared/identity-revealed.directive.ts
@@ -4,7 +4,7 @@ import { AbstractControl, FormGroup, NG_VALIDATORS, ValidationErrors, Validator,
 
 // #docregion cross-validation-validator
 /** A hero's name can't match the hero's alter ego */
-export const identityRevealedValidator: ValidatorFn = (control: FormGroup): ValidationErrors | null => {
+export const identityRevealedValidator: ValidatorFn = (control: AbstractControl): ValidationErrors | null => {
   const name = control.get('name');
   const alterEgo = control.get('alterEgo');