diff --git a/vendor/SerialsSolutions/Summon/Base.php b/vendor/SerialsSolutions/Summon/Base.php
index af230d8b745649db8d00155f6f78ff3080e1dfcc..a7296d5ec075439bc7b9f27964e02e87d71ff2a9 100644
--- a/vendor/SerialsSolutions/Summon/Base.php
+++ b/vendor/SerialsSolutions/Summon/Base.php
@@ -26,7 +26,7 @@
  * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
  * @link     http://api.summon.serialssolutions.com/help/api/ API Documentation
  */
-require_once 'SerialsSolutions/Summon/Exception.php';
+require_once dirname(__FILE__) . '/Exception.php';
 
 /**
  * Summon REST API Interface (abstract base class)
diff --git a/vendor/SerialsSolutions/Summon/PEAR.php b/vendor/SerialsSolutions/Summon/PEAR.php
index 21832a8ac09513021e5c821df382fc856d66b662..a78f203ec2e77c61574fa7024f76c3a669aaa77f 100644
--- a/vendor/SerialsSolutions/Summon/PEAR.php
+++ b/vendor/SerialsSolutions/Summon/PEAR.php
@@ -28,7 +28,7 @@
  */
 require_once 'PEAR.php';
 require_once 'HTTP/Request.php';
-require_once 'SerialsSolutions/Summon/Base.php';
+require_once dirname(__FILE__) . '/Base.php';
 
 /**
  * Summon Search API Interface (PEAR implementation)
diff --git a/vendor/SerialsSolutions/Summon/Zend.php b/vendor/SerialsSolutions/Summon/Zend.php
index 10cc5db9a940911243dd1a34ce635c5f9f3ecafd..ce22b5ed1e6415ab36cf295e3fa1a1ac5982aef5 100644
--- a/vendor/SerialsSolutions/Summon/Zend.php
+++ b/vendor/SerialsSolutions/Summon/Zend.php
@@ -27,7 +27,7 @@
  * @link     http://api.summon.serialssolutions.com/help/api/ API Documentation
  */
 require_once 'Zend/Http/Client.php';
-require_once 'SerialsSolutions/Summon/Base.php';
+require_once dirname(__FILE__) . '/Base.php';
 
 /**
  * Summon Search API Interface (Zend implementation)