diff --git a/src/Api/AbstractApi.php b/src/Api/AbstractApi.php
index 95ed1376..5c81d6fd 100644
--- a/src/Api/AbstractApi.php
+++ b/src/Api/AbstractApi.php
@@ -36,7 +36,7 @@ abstract class AbstractApi
      *
      * @var string
      */
-    private const URI_PREFIX = 'api/v4/';
+    private const URI_PREFIX = '/api/v4/';
 
     /**
      * The client instance.
diff --git a/src/Client.php b/src/Client.php
index 872d8369..4c750d03 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -50,7 +50,7 @@
 use Gitlab\HttpClient\Plugin\ExceptionThrower;
 use Gitlab\HttpClient\Plugin\History;
 use Http\Client\Common\HttpMethodsClientInterface;
-use Http\Client\Common\Plugin\AddHostPlugin;
+use Http\Client\Common\Plugin\BaseUriPlugin;
 use Http\Client\Common\Plugin\HeaderDefaultsPlugin;
 use Http\Client\Common\Plugin\HistoryPlugin;
 use Http\Client\Common\Plugin\RedirectPlugin;
@@ -415,8 +415,8 @@ public function setUrl(string $url): void
     {
         $uri = $this->getHttpClientBuilder()->getUriFactory()->createUri($url);
 
-        $this->getHttpClientBuilder()->removePlugin(AddHostPlugin::class);
-        $this->getHttpClientBuilder()->addPlugin(new AddHostPlugin($uri));
+        $this->getHttpClientBuilder()->removePlugin(BaseUriPlugin::class);
+        $this->getHttpClientBuilder()->addPlugin(new BaseUriPlugin($uri));
     }
 
     /**