diff --git a/src/Controller/YoastSeoController.php b/src/Controller/YoastSeoController.php
index 5f73f66..e5ce3aa 100644
--- a/src/Controller/YoastSeoController.php
+++ b/src/Controller/YoastSeoController.php
@@ -64,11 +64,11 @@ class YoastSeoController extends ControllerBase {
       // Inform the user about altering the XML Sitemap configuration on the
       // module configuration page if he has access to do so.
       if (\Drupal::currentUser()->hasPermission('administer xmlsitemap')) {
-        $xmlsitemap_description = t(
+        $xmlsitemap_description = $this->t(
           'You can configure the XML Sitemap settings at the @url.',
           [
             '@url' => \Drupal::l(
-              t('XML Sitemap configuration page'),
+              $this->t('XML Sitemap configuration page'),
               Url::fromRoute('xmlsitemap.admin_search')
             ),
           ]
@@ -76,13 +76,13 @@ class YoastSeoController extends ControllerBase {
       }
       else {
         $xmlsitemap_description
-          = t('You do not have the permission to administer XML Sitemap.');
+          = $this->t('You do not have the permission to administer XML Sitemap.');
       }
     }
     else {
       // XML Sitemap is not enabled, inform the user he should think about
       // installing and enabling it.
-      $xmlsitemap_description = t(
+      $xmlsitemap_description = $this->t(
         'You currently do not have XML Sitemap enabled. We strongly recommend you to install XML Sitemap. You can download the module from <a href="@project-page-url">@project-page-url</a>.',
         ['@project-page-url' => 'https://www.drupal.org/project/xmlsitemap']
       );
@@ -90,7 +90,7 @@ class YoastSeoController extends ControllerBase {
 
     $form['xmlsitemap'] = [
       '#type' => 'details',
-      '#title' => t('XML Sitemap'),
+      '#title' => $this->t('XML Sitemap'),
       '#markup' => $xmlsitemap_description,
       '#open' => TRUE,
     ];
@@ -99,11 +99,11 @@ class YoastSeoController extends ControllerBase {
     // configuration page if he has access to do so.
     // We do not check if the module is enabled since it is our dependency.
     if (\Drupal::currentUser()->hasPermission('administer meta tags')) {
-      $metatag_description = t(
+      $metatag_description = $this->t(
         'You can configure and override the Metatag title & description default settings at the @url.',
         [
           '@url' => \Drupal::l(
-            t('Metatag configuration page'),
+            $this->t('Metatag configuration page'),
             Url::fromRoute('entity.metatag_defaults.collection')
           ),
         ]
@@ -111,12 +111,12 @@ class YoastSeoController extends ControllerBase {
     }
     else {
       $metatag_description
-        = t('You currently do not have the permission to administer Metatag.');
+        = $this->t('You currently do not have the permission to administer Metatag.');
     }
 
     $form['metatag'] = [
       '#type' => 'details',
-      '#title' => t('Configure Metatag default templates'),
+      '#title' => $this->t('Configure Metatag default templates'),
       '#markup' => $metatag_description,
       '#open' => TRUE,
     ];
diff --git a/src/Form/YoastSeoConfigForm.php b/src/Form/YoastSeoConfigForm.php
index a603aed..d0f44e1 100644
--- a/src/Form/YoastSeoConfigForm.php
+++ b/src/Form/YoastSeoConfigForm.php
@@ -37,7 +37,7 @@ class YoastSeoConfigForm extends FormBase {
       // enable/disable Yoast SEO for supported bundles.
       $form[$entity_type] = array(
         '#type' => 'checkboxes',
-        '#title' => t('@label', array('@label' => $entity_label)),
+        '#title' => $this->t('@label', array('@label' => $entity_label)),
         '#options' => $options,
         '#required' => FALSE,
         '#default_value' => $enabled_bundles,
@@ -48,7 +48,7 @@ class YoastSeoConfigForm extends FormBase {
     $form['actions']           = array('#type' => 'actions');
     $form['actions']['submit'] = array(
       '#type' => 'submit',
-      '#value' => t('Save'),
+      '#value' => $this->t('Save'),
     );
 
     return $form;
diff --git a/src/Plugin/Field/FieldWidget/YoastSeoWidget.php b/src/Plugin/Field/FieldWidget/YoastSeoWidget.php
index ae951fd..1bcefc0 100644
--- a/src/Plugin/Field/FieldWidget/YoastSeoWidget.php
+++ b/src/Plugin/Field/FieldWidget/YoastSeoWidget.php
@@ -77,7 +77,7 @@ class YoastSeoWidget extends WidgetBase implements ContainerFactoryPluginInterfa
   public function settingsSummary() {
     $summary = [];
 
-    $summary[] = t('Body: @body', ['@body' => $this->getSetting('body')]);
+    $summary[] = $this->t('Body: @body', ['@body' => $this->getSetting('body')]);
 
     return $summary;
   }
@@ -107,7 +107,7 @@ class YoastSeoWidget extends WidgetBase implements ContainerFactoryPluginInterfa
 
     $element['body'] = [
       '#type' => 'select',
-      '#title' => t('Body'),
+      '#title' => $this->t('Body'),
       '#required' => TRUE,
       '#description' => $this->t('Select a field which is used as the body field.'),
       '#options' => $text_fields,
@@ -126,7 +126,7 @@ class YoastSeoWidget extends WidgetBase implements ContainerFactoryPluginInterfa
     // Create the form element.
     $element['yoast_seo'] = array(
       '#type' => 'details',
-      '#title' => t('Real-time SEO for drupal'),
+      '#title' => $this->t('Real-time SEO for drupal'),
       '#open' => TRUE,
       '#attached' => array(
         'library' => array(
@@ -138,16 +138,16 @@ class YoastSeoWidget extends WidgetBase implements ContainerFactoryPluginInterfa
 
     $element['yoast_seo']['focus_keyword'] = array(
       '#type' => 'textfield',
-      '#title' => t('Focus keyword'),
+      '#title' => $this->t('Focus keyword'),
       '#default_value' => isset($items[$delta]->focus_keyword) ? $items[$delta]->focus_keyword : NULL,
-      '#description' => t("Pick the main keyword or keyphrase that this post/page is about."),
+      '#description' => $this->t("Pick the main keyword or keyphrase that this post/page is about."),
     );
 
     $element['yoast_seo']['status'] = array(
       '#type' => 'hidden',
-      '#title' => t('Real-time SEO status'),
+      '#title' => $this->t('Real-time SEO status'),
       '#default_value' => isset($items[$delta]->status) ? $items[$delta]->status : NULL,
-      '#description' => t("The SEO status in points."),
+      '#description' => $this->t("The SEO status in points."),
     );
 
     return $element;