diff --git a/lib/API/JSON/v1/Subscribers.php b/lib/API/JSON/v1/Subscribers.php
index 48423400e3..06362c6a29 100644
--- a/lib/API/JSON/v1/Subscribers.php
+++ b/lib/API/JSON/v1/Subscribers.php
@@ -276,7 +276,7 @@ class Subscribers extends APIEndpoint {
         $meta = [];
         $meta['redirect_url'] = SubscriptionUrl::getCaptchaUrl();
         return $this->badRequest([
-          APIError::BAD_REQUEST => WPFunctions::get()->__('Please check the CAPTCHA.', 'mailpoet'),
+          APIError::BAD_REQUEST => WPFunctions::get()->__('Please fill in the CAPTCHA.', 'mailpoet'),
         ], $meta);
       }
     }
diff --git a/tests/integration/API/JSON/v1/SubscribersTest.php b/tests/integration/API/JSON/v1/SubscribersTest.php
index d309cff9f2..36136b96e6 100644
--- a/tests/integration/API/JSON/v1/SubscribersTest.php
+++ b/tests/integration/API/JSON/v1/SubscribersTest.php
@@ -533,7 +533,7 @@ class SubscribersTest extends \MailPoetTest {
       $this->obfuscatedSegments => [$this->segment_1->id, $this->segment_2->id],
     ]);
     expect($response->status)->equals(APIResponse::STATUS_BAD_REQUEST);
-    expect($response->errors[0]['message'])->equals('Please check the CAPTCHA.');
+    expect($response->errors[0]['message'])->equals('Please fill in the CAPTCHA.');
     $this->settings->set('captcha', []);
   }