diff --git a/src/Client.php b/src/Client.php
index 521ddaa7a..fe534715f 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -837,7 +837,7 @@ protected function _buildTransport(array $config): Transport
 
         // Http client
         if (isset($transportConfig['http_client'])) {
-            $builder->setClient($config['http_client']);
+            $builder->setClient($transportConfig['http_client']);
         }
 
         // Set HTTP client options