diff --git a/tasks/phpstan/phpstan-baseline-unit-tests.neon b/tasks/phpstan/phpstan-baseline-unit-tests.neon
index 7c3941a2ef..daee05bbe3 100644
--- a/tasks/phpstan/phpstan-baseline-unit-tests.neon
+++ b/tasks/phpstan/phpstan-baseline-unit-tests.neon
@@ -45,16 +45,6 @@ parameters:
 			count: 1
 			path: ../../tests/acceptance/ViewSegmentSubscribersCest.php
 
-		-
-			message: "#^Property MailPoet\\\\Test\\\\Subscribers\\\\ImportExport\\\\Import\\\\MailChimpTest\\:\\:\\$apiKey \\(string\\) does not accept string\\|false\\.$#"
-			count: 1
-			path: ../../tests/unit/Subscribers/ImportExport/Import/MailChimpTest.php
-
-		-
-			message: "#^Parameter \\#2 \\$str of function explode expects string, string\\|false given\\.$#"
-			count: 1
-			path: ../../tests/unit/Subscribers/ImportExport/Import/MailChimpTest.php
-
 		-
 			message: "#^Property MailPoet\\\\Test\\\\WP\\\\ReadmeTest\\:\\:\\$data \\(string\\) does not accept string\\|false\\.$#"
 			count: 1
diff --git a/tests/unit/Subscribers/ImportExport/Import/MailChimpTest.php b/tests/integration/Subscribers/ImportExport/Import/MailChimpTest.php
similarity index 95%
rename from tests/unit/Subscribers/ImportExport/Import/MailChimpTest.php
rename to tests/integration/Subscribers/ImportExport/Import/MailChimpTest.php
index f1407c48fd..31e2a59ee3 100644
--- a/tests/unit/Subscribers/ImportExport/Import/MailChimpTest.php
+++ b/tests/integration/Subscribers/ImportExport/Import/MailChimpTest.php
@@ -6,7 +6,7 @@ use Codeception\Stub;
 use MailPoet\Subscribers\ImportExport\Import\MailChimp;
 use MailPoet\WP\Functions as WPFunctions;
 
-class MailChimpTest extends \MailPoetUnitTest {
+class MailChimpTest extends \MailPoetTest {
   /** @var string */
   private $apiKey;
 
@@ -18,9 +18,9 @@ class MailChimpTest extends \MailPoetUnitTest {
 
   public function __construct() {
     parent::__construct();
-    $this->apiKey = getenv('WP_TEST_IMPORT_MAILCHIMP_API');
+    $this->apiKey = (string)getenv('WP_TEST_IMPORT_MAILCHIMP_API');
     $this->mailchimp = new MailChimp($this->apiKey);
-    $this->lists = explode(",", getenv('WP_TEST_IMPORT_MAILCHIMP_LISTS'));
+    $this->lists = explode(",", (string)getenv('WP_TEST_IMPORT_MAILCHIMP_LISTS'));
   }
 
   public function _before() {