diff --git a/src/SDK/Common/Http/Psr/Client/Discovery/Guzzle.php b/src/SDK/Common/Http/Psr/Client/Discovery/Guzzle.php
index 8d013c901..d87367416 100644
--- a/src/SDK/Common/Http/Psr/Client/Discovery/Guzzle.php
+++ b/src/SDK/Common/Http/Psr/Client/Discovery/Guzzle.php
@@ -11,7 +11,7 @@ class Guzzle implements DiscoveryInterface
 {
     public function available(): bool
     {
-        return class_exists(Client::class);
+        return class_exists(Client::class) && is_a(Client::class, ClientInterface::class, true);
     }
 
     public function create(mixed $options): ClientInterface