diff --git a/mailpoet/assets/js/src/public.jsx b/mailpoet/assets/js/src/public.jsx
index 2e8a37bdec..bc29359856 100644
--- a/mailpoet/assets/js/src/public.jsx
+++ b/mailpoet/assets/js/src/public.jsx
@@ -106,8 +106,8 @@ jQuery(($) => {
         }
       })
       .done((response) => {
-        if (window.grecaptcha && formData.recaptcha) {
-          window.grecaptcha.reset(formData.recaptcha);
+        if (window.grecaptcha && formData.recaptchaWidgetId) {
+          window.grecaptcha.reset(formData.recaptchaWidgetId);
         }
         return response;
       })
@@ -129,8 +129,8 @@ jQuery(($) => {
         // reset validation
         parsley.reset();
         // reset captcha
-        if (window.grecaptcha && formData.recaptcha) {
-          window.grecaptcha.reset(formData.recaptcha);
+        if (window.grecaptcha && formData.recaptchaWidgetId) {
+          window.grecaptcha.reset(formData.recaptchaWidgetId);
         }
 
         // resize iframe
@@ -171,9 +171,11 @@ jQuery(($) => {
       const params = { sitekey, size };
 
       if (size === 'invisible') {
-        params.callback = function invisibleReCaptchaCallback(token) {
+        params.callback = function invisibleReCaptchaCallback(
+          recaptchaResponseToken,
+        ) {
           const formData = form.mailpoetSerializeObject() || {};
-          formData.data.recaptcha = token;
+          formData.data.recaptchaResponseToken = recaptchaResponseToken;
 
           submitSubscribeForm(form, formData, form.parsley());
         };
@@ -398,7 +400,7 @@ jQuery(($) => {
         const formData = form.mailpoetSerializeObject() || {};
         const size = form.find('.mailpoet_recaptcha').attr('data-size');
 
-        if (window.grecaptcha && formData.recaptcha) {
+        if (window.grecaptcha && formData.recaptchaWidgetId) {
           // The API for the invisible and checkbox ReCaptchas is slightly different. For the
           // former, we need to call execute() and then the ReCaptcha API calls the callback set
           // inside renderCaptcha() with a token if the captcha was solved successfully. The
@@ -408,9 +410,8 @@ jQuery(($) => {
           if (size === 'invisible') {
             window.grecaptcha.execute();
           } else {
-            formData.data.recaptcha = window.grecaptcha.getResponse(
-              formData.recaptcha,
-            );
+            formData.data.recaptchaResponseToken =
+              window.grecaptcha.getResponse(formData.recaptchaWidgetId);
           }
         }
 
diff --git a/mailpoet/lib/Form/Renderer.php b/mailpoet/lib/Form/Renderer.php
index d5d3a9fa3c..97ae115b16 100644
--- a/mailpoet/lib/Form/Renderer.php
+++ b/mailpoet/lib/Form/Renderer.php
@@ -113,7 +113,7 @@ class Renderer {
           </div>
         </div>
       </noscript>
-      <input class="mailpoet_recaptcha_field" type="hidden" name="recaptcha">
+      <input class="mailpoet_recaptcha_field" type="hidden" name="recaptchaWidgetId">
     </div>';
 
     return $html;
diff --git a/mailpoet/lib/Subscribers/SubscriberSubscribeController.php b/mailpoet/lib/Subscribers/SubscriberSubscribeController.php
index 8ff8f3ef95..aed98c75ab 100644
--- a/mailpoet/lib/Subscribers/SubscriberSubscribeController.php
+++ b/mailpoet/lib/Subscribers/SubscriberSubscribeController.php
@@ -216,7 +216,7 @@ class SubscriberSubscribeController {
       }
     }
 
-    if (Captcha::isReCaptcha($captchaSettings['type']) && empty($data['recaptcha'])) {
+    if (Captcha::isReCaptcha($captchaSettings['type']) && empty($data['recaptchaResponseToken'])) {
       return ['error' => __('Please check the CAPTCHA.', 'mailpoet')];
     }
 
@@ -227,7 +227,7 @@ class SubscriberSubscribeController {
         $secretToken = $captchaSettings['recaptcha_secret_token'];
       }
 
-      $response = empty($data['recaptcha']) ? $data['recaptcha-no-js'] : $data['recaptcha'];
+      $response = empty($data['recaptchaResponseToken']) ? $data['recaptcha-no-js'] : $data['recaptchaResponseToken'];
       $response = $this->wp->wpRemotePost('https://www.google.com/recaptcha/api/siteverify', [
         'body' => [
           'secret' => $secretToken,