diff --git a/src/Form/W3CValidatorOperationForm.php b/src/Form/W3CValidatorOperationForm.php
index ea37c76..5d201c2 100644
--- a/src/Form/W3CValidatorOperationForm.php
+++ b/src/Form/W3CValidatorOperationForm.php
@@ -46,7 +46,7 @@ class W3CValidatorOperationForm extends FormBase {
   /**
    * {@inheritdoc}
    */
-  public function getFormID() {
+  public function getFormId() {
     return 'w3c_validator_operation_form';
   }