diff --git a/src/Program.php b/src/Program.php
index 17324af..28e214a 100644
--- a/src/Program.php
+++ b/src/Program.php
@@ -14,7 +14,7 @@ public function __construct(SolanaRpcClient $client)
         $this->client = $client;
     }
 
-    public function __call($method, $params = []): ?array
+    public function __call($method, $params = [])
     {
         return $this->client->call($method, ...$params);
     }