diff --git a/src/Client/Common.php b/src/Client/Common.php
index 0d9007b1..6678c7df 100644
--- a/src/Client/Common.php
+++ b/src/Client/Common.php
@@ -22,14 +22,14 @@ class Common extends \SoapClient
     /**
      * doRequest() pre-processing method
      *
-     * @var callback
+     * @var callable
      */
     protected $doRequestCallback;
 
     /**
      * Common Soap Client constructor
      *
-     * @param callback $doRequestMethod
+     * @param callable $doRequestMethod
      * @param string $wsdl
      * @param array $options
      */