diff --git a/src/Call/Handler/RuntimeCallHandler.php b/src/Call/Handler/RuntimeCallHandler.php
index 05df5d4..52d5e8b 100644
--- a/src/Call/Handler/RuntimeCallHandler.php
+++ b/src/Call/Handler/RuntimeCallHandler.php
@@ -126,7 +126,7 @@ private function executeCall(Call $call)
 
         try {
             $this->call = $call;
-            $return = call_user_func_array($callable, $arguments);
+            $return = call_user_func_array($callable, array_values($arguments));
         } catch (Exception $caught) {
             $exception = $caught;
         }