diff --git a/src/Endpoints/SubscriptionEndpoint.php b/src/Endpoints/SubscriptionEndpoint.php
index 8e2d8122..f85a89f6 100644
--- a/src/Endpoints/SubscriptionEndpoint.php
+++ b/src/Endpoints/SubscriptionEndpoint.php
@@ -194,7 +194,7 @@ public function iteratorForId(string $customerId, ?string $from = null, ?int $li
      * @param string $subscriptionId
      * @param array $data
      *
-     * @return null
+     * @return mixed
      * @throws ApiException
      */
     public function cancelFor(Customer $customer, $subscriptionId, array $data = [])
@@ -207,7 +207,7 @@ public function cancelFor(Customer $customer, $subscriptionId, array $data = [])
      * @param string $subscriptionId
      * @param array $data
      *
-     * @return null
+     * @return mixed
      * @throws ApiException
      */
     public function cancelForId($customerId, $subscriptionId, array $data = [])