diff --git a/mailpoet/lib/API/JSON/v1/AutomatedLatestContent.php b/mailpoet/lib/API/JSON/v1/AutomatedLatestContent.php
index dc48d2c237..13956bb0c8 100644
--- a/mailpoet/lib/API/JSON/v1/AutomatedLatestContent.php
+++ b/mailpoet/lib/API/JSON/v1/AutomatedLatestContent.php
@@ -59,8 +59,8 @@ class AutomatedLatestContent extends APIEndpoint {
       'order' => 'ASC',
     ];
 
-    $args = $this->wp->applyFilters('mailpoet_search_terms_args', $args);
-    $terms = WPPosts::getTerms($args);
+    $args = (array)$this->wp->applyFilters('mailpoet_search_terms_args', $args);
+    $terms = WPFunctions::get()->getTerms($args);
 
     return $this->successResponse(array_values($terms));
   }
diff --git a/mailpoet/lib/WP/Posts.php b/mailpoet/lib/WP/Posts.php
index 1d89a93771..5a809de4c7 100644
--- a/mailpoet/lib/WP/Posts.php
+++ b/mailpoet/lib/WP/Posts.php
@@ -5,18 +5,6 @@ namespace MailPoet\WP;
 use MailPoet\WP\Functions as WPFunctions;
 
 class Posts {
-  public static function getTerms($args) {
-    // Since WordPress 4.5.0 signature of get_terms changed to require
-    // one argument array, where taxonomy is key of that array
-    if (version_compare(WPFunctions::get()->getBloginfo('version'), '4.5.0', '>=')) {
-      return WPFunctions::get()->getTerms($args);
-    } else {
-      $taxonomy = $args['taxonomy'];
-      unset($args['taxonomy']);
-      return WPFunctions::get()->getTerms($taxonomy, $args);
-    }
-  }
-
   public static function getTypes($args = [], $output = 'names', $operator = 'and') {
     $defaults = [
       'exclude_from_search' => false,
diff --git a/mailpoet/tests/integration/API/JSON/v1/AutomatedLatestContentTest.php b/mailpoet/tests/integration/API/JSON/v1/AutomatedLatestContentTest.php
index b7323ed62e..450b3fa864 100644
--- a/mailpoet/tests/integration/API/JSON/v1/AutomatedLatestContentTest.php
+++ b/mailpoet/tests/integration/API/JSON/v1/AutomatedLatestContentTest.php
@@ -2,12 +2,21 @@
 
 namespace MailPoet\Test\API\JSON\v1;
 
+use MailPoet\API\JSON\SuccessResponse;
 use MailPoet\API\JSON\v1\AutomatedLatestContent;
 
 class AutomatedLatestContentTest extends \MailPoetTest {
+  /** @var AutomatedLatestContent */
+  private $endpoint;
+
+  public function _before() {
+    parent::_before();
+
+    $this->endpoint = $this->diContainer->get(AutomatedLatestContent::class);
+  }
+
   public function testItGetsPostTypes() {
-    $endpoint = $this->diContainer->get(AutomatedLatestContent::class);
-    $response = $endpoint->getPostTypes();
+    $response = $this->endpoint->getPostTypes();
     expect($response->data)->notEmpty();
     foreach ($response->data as $postType) {
       expect($postType)->count(2);
@@ -17,8 +26,7 @@ class AutomatedLatestContentTest extends \MailPoetTest {
   }
 
   public function testItDoesNotGetPostTypesExludedFromSearch() {
-    $endpoint = $this->diContainer->get(AutomatedLatestContent::class);
-    $response = $endpoint ->getPostTypes();
+    $response = $this->endpoint ->getPostTypes();
     // WP's default post type 'revision' is excluded from search
     // https://codex.wordpress.org/Post_Types
     $revisionPostType = get_post_type_object('revision');
@@ -26,4 +34,12 @@ class AutomatedLatestContentTest extends \MailPoetTest {
     expect($revisionPostType->exclude_from_search)->true(); // phpcs:ignore Squiz.NamingConventions.ValidVariableName.MemberNotCamelCaps
     expect(isset($response->data['revision']))->false();
   }
+
+  public function testItGetTerms() {
+    $response = $this->endpoint->getTerms();
+
+    $this->assertInstanceOf(SuccessResponse::class, $response);
+    $this->assertCount(1, $response->data);
+    $this->assertSame('Uncategorized', $response->data['0']->name);
+  }
 }
diff --git a/mailpoet/tests/unit/WP/PostsTest.php b/mailpoet/tests/unit/WP/PostsTest.php
deleted file mode 100644
index c69e1eca91..0000000000
--- a/mailpoet/tests/unit/WP/PostsTest.php
+++ /dev/null
@@ -1,60 +0,0 @@
-<?php
-
-namespace MailPoet\Test\WP;
-
-use Codeception\Util\Stub;
-use MailPoet\WP\Functions as WPFunctions;
-use MailPoet\WP\Posts;
-
-class PostsTest extends \MailPoetUnitTest {
-  public function testGetTermsProxiesCallToWordPress() {
-    $args = [
-      'taxonomy' => 'post_tags',
-      'hide_empty' => true,
-    ];
-
-    WPFunctions::set(Stub::make(new WPFunctions, [
-      'getBloginfo' => function($key) {
-        return '4.6.0';
-      },
-      'getTerms' => function($key) {
-        return [
-          'call check' => 'get_terms called',
-          'arguments' => func_get_args(),
-        ];
-      },
-    ]));
-
-    $result = Posts::getTerms($args);
-    expect($result['call check'])->equals('get_terms called');
-    expect($result['arguments'][0])->equals($args);
-  }
-
-  public function testGetTermsPassesTaxonomyAsFirstArgumentInOldVersions() {
-    $args = [
-      'taxonomy' => 'post_tags',
-      'hide_empty' => true,
-    ];
-
-    WPFunctions::set(Stub::make(new WPFunctions, [
-      'getBloginfo' => function($key) {
-        return '4.4.0';
-      },
-      'getTerms' => function($key) {
-        return [
-          'call check' => 'get_terms called',
-          'arguments' => func_get_args(),
-        ];
-      },
-    ]));
-
-    $result = Posts::getTerms($args);
-    expect($result['call check'])->equals('get_terms called');
-    expect($result['arguments'][0])->equals($args['taxonomy']);
-    expect($result['arguments'][1])->equals(array_diff_key($args, ['taxonomy' => '']));
-  }
-
-  public function _after() {
-    WPFunctions::set(new WPFunctions);
-  }
-}