diff --git a/projects/ngx-valdemort/src/lib/validation-error.directive.ts b/projects/ngx-valdemort/src/lib/validation-error.directive.ts
index 4d7b9630..5de3b5a9 100644
--- a/projects/ngx-valdemort/src/lib/validation-error.directive.ts
+++ b/projects/ngx-valdemort/src/lib/validation-error.directive.ts
@@ -30,7 +30,7 @@ export class ValidationErrorDirective {
   /**
    * The type of the error that the content of the template must display.
    */
-  @Input('valError') type = '';
+  @Input({ alias: 'valError', required: true }) type = '';
 
   constructor(public templateRef: TemplateRef<ValidationErrorContext>) {}