diff --git a/lib/Cake/Network/CakeResponse.php b/lib/Cake/Network/CakeResponse.php
index 5fd1ac71b..b8aa9e643 100644
--- a/lib/Cake/Network/CakeResponse.php
+++ b/lib/Cake/Network/CakeResponse.php
@@ -855,7 +855,7 @@ class CakeResponse {
 		}
 
 		$this->maxAge($time);
-		if ($time === null) {
+		if ((int)$time === 0) {
 			$this->_setCacheControl();
 		}
 		return (bool)$public;