diff --git a/app/code/Magento/Customer/view/frontend/templates/widget/telephone.phtml b/app/code/Magento/Customer/view/frontend/templates/widget/telephone.phtml
index 1b61dc45573b3..6367bf10bbade 100644
--- a/app/code/Magento/Customer/view/frontend/templates/widget/telephone.phtml
+++ b/app/code/Magento/Customer/view/frontend/templates/widget/telephone.phtml
@@ -19,7 +19,7 @@
         <?php
             $_validationClass = $block->escapeHtmlAttr(
                 $this->helper('Magento\Customer\Helper\Address')
-                     ->getAttributeValidationClass('fax')
+                     ->getAttributeValidationClass('telephone')
             );
         ?>
         <input type="text"