diff --git a/App.php b/App.php
index c8fccae..ebf43d1 100644
--- a/App.php
+++ b/App.php
@@ -132,7 +132,8 @@ public function setCallstack(ExecutableInterface $executable)
             throw new LogicException('Apps Middlewares cannot be empty while using callstack!');
         }
 
-        array_push($this->callstack, $this->middlewares, $executable);
+        $this->callstack = array_merge($this->callstack, $this->middlewares);
+        array_push($this->callstack, $executable);
     }
 
     /**