diff --git a/lib/Resque/Job.php b/lib/Resque/Job.php
index 9d674f5..5df0fb6 100644
--- a/lib/Resque/Job.php
+++ b/lib/Resque/Job.php
@@ -142,7 +142,7 @@ class Resque_Job
 			return $this->instance;
 		}
 
-		if(!class_exists($this->payload['class'])) {
+		if(!class_exists($this->payload['class'], false)) {
 			throw new Resque_Exception(
 				'Could not find job class ' . $this->payload['class'] . '.'
 			);
diff --git a/lib/Resque/Redis.php b/lib/Resque/Redis.php
index 874bf69..78d3ac7 100644
--- a/lib/Resque/Redis.php
+++ b/lib/Resque/Redis.php
@@ -1,7 +1,7 @@
 <?php
 // Third- party apps may have already loaded Resident from elsewhere
 // so lets be careful.
-if(!class_exists('Redisent')) {
+if(!class_exists('Redisent', false)) {
 	require_once dirname(__FILE__) . '/../Redisent/Redisent.php';
 }
 
diff --git a/lib/Resque/RedisCluster.php b/lib/Resque/RedisCluster.php
index 6ac15e3..dc3f728 100644
--- a/lib/Resque/RedisCluster.php
+++ b/lib/Resque/RedisCluster.php
@@ -1,7 +1,7 @@
 <?php
 // Third- party apps may have already loaded Resident from elsewhere
 // so lets be careful.
-if(!class_exists('RedisentCluster')) {
+if(!class_exists('RedisentCluster', false)) {
 	require_once dirname(__FILE__) . '/../Redisent/RedisentCluster.php';
 }