diff --git a/lib/API/JSON/v1/Newsletters.php b/lib/API/JSON/v1/Newsletters.php
index eb7cfff49e..42c1de3b0c 100644
--- a/lib/API/JSON/v1/Newsletters.php
+++ b/lib/API/JSON/v1/Newsletters.php
@@ -33,18 +33,21 @@ class Newsletters extends APIEndpoint {
   /** @var Listing\Handler */
   private $listing_handler;
 
+  /** @var WPFunctions */
+  private $wp;
+
   public $permissions = array(
     'global' => AccessControl::PERMISSION_MANAGE_EMAILS
   );
-  private $wp;
 
   function __construct(
     Listing\BulkActionController $bulk_action,
-    Listing\Handler $listing_handler
+    Listing\Handler $listing_handler,
+    WPFunctions $wp
   ) {
     $this->bulk_action = $bulk_action;
     $this->listing_handler = $listing_handler;
-    $this->wp = new WPFunctions;
+    $this->wp = $wp;
   }
 
   function get($data = array()) {
diff --git a/lib/DI/ContainerConfigurator.php b/lib/DI/ContainerConfigurator.php
index 7227f7deb1..f865a2a4c8 100644
--- a/lib/DI/ContainerConfigurator.php
+++ b/lib/DI/ContainerConfigurator.php
@@ -72,6 +72,8 @@ class ContainerConfigurator implements IContainerConfigurator {
     $container->autowire(\MailPoet\Subscription\Form::class)->setPublic(true);
     // Newsletter
     $container->autowire(\MailPoet\Newsletter\AutomatedLatestContent::class)->setPublic(true);
+    // WordPress
+    $container->autowire(\MailPoet\WP\Functions::class)->setPublic(true);
     return $container;
   }