diff --git a/Block/System/Config/Field/Readonlyfield.php b/Block/System/Config/Field/Readonlyfield.php
new file mode 100644
index 00000000..62e64846
--- /dev/null
+++ b/Block/System/Config/Field/Readonlyfield.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace Extend\Warranty\Block\System\Config\Field;
+
+use Magento\Framework\Data\Form\Element\AbstractElement;
+use Magento\Config\Block\System\Config\Form\Field;
+
+class ReadonlyField extends Field
+{
+    protected function _getElementHtml(AbstractElement $element)
+    {
+        $element->setData('readonly', 'readonly');
+        return $element->getElementHtml();
+    }
+}
diff --git a/etc/adminhtml/system.xml b/etc/adminhtml/system.xml
index d4807160..f34bc49a 100644
--- a/etc/adminhtml/system.xml
+++ b/etc/adminhtml/system.xml
@@ -216,8 +216,8 @@
                     </comment>
                     <depends>
                         <field id="warranty/authentication/auth_mode">1</field>
-                    </depends>
-                    <disabled>1</disabled>
+		    </depends>
+		    <frontend_model>Extend\Warranty\Block\System\Config\Field\Readonlyfield</frontend_model>
                 </field>
                 <field id="client_id"
                        translate="label comment"
@@ -297,7 +297,8 @@
                     </comment>
                     <depends>
                         <field id="warranty/authentication/auth_mode">0</field>
-                    </depends>
+		    </depends>
+		    <frontend_model>Extend\Warranty\Block\System\Config\Field\Readonlyfield</frontend_model>
                 </field>
                 <field id="sandbox_client_id"
                        translate="label comment"