diff --git a/lib/Cake/Cache/Engine/ApcEngine.php b/lib/Cake/Cache/Engine/ApcEngine.php
index 5c154e6d8..301299cc5 100644
--- a/lib/Cake/Cache/Engine/ApcEngine.php
+++ b/lib/Cake/Cache/Engine/ApcEngine.php
@@ -125,7 +125,7 @@ class ApcEngine extends CacheEngine {
 		if ($check) {
 			return true;
 		}
-		if (class_exists('APCIterator')) {
+		if (class_exists('APCIterator', false)) {
 			$iterator = new APCIterator(
 				'user',
 				'/^' . preg_quote($this->settings['prefix'], '/') . '/',