diff --git a/src/HttpClientRouter.php b/src/HttpClientRouter.php
index 971597b..84c7e04 100644
--- a/src/HttpClientRouter.php
+++ b/src/HttpClientRouter.php
@@ -6,7 +6,6 @@
 
 use Http\Client\Common\Exception\HttpClientNoMatchException;
 use Http\Client\HttpAsyncClient;
-use Http\Client\HttpClient;
 use Http\Message\RequestMatcher;
 use Psr\Http\Client\ClientInterface;
 use Psr\Http\Message\RequestInterface;
@@ -43,7 +42,7 @@ public function sendAsyncRequest(RequestInterface $request)
     /**
      * Add a client to the router.
      *
-     * @param HttpClient|HttpAsyncClient $client
+     * @param ClientInterface|HttpAsyncClient $client
      */
     public function addClient($client, RequestMatcher $requestMatcher): void
     {
diff --git a/src/PluginClient.php b/src/PluginClient.php
index a3a4023..8288445 100644
--- a/src/PluginClient.php
+++ b/src/PluginClient.php
@@ -73,7 +73,7 @@ public function __construct($client, array $plugins = [], array $options = [])
     public function sendRequest(RequestInterface $request): ResponseInterface
     {
         // If we don't have an http client, use the async call
-        if (!($this->client instanceof HttpClient)) {
+        if (!($this->client instanceof ClientInterface)) {
             return $this->sendAsyncRequest($request)->wait();
         }