diff --git a/lib/Cake/Model/Datasource/DboSource.php b/lib/Cake/Model/Datasource/DboSource.php
index 135dfe0553a..b3ae8d81422 100644
--- a/lib/Cake/Model/Datasource/DboSource.php
+++ b/lib/Cake/Model/Datasource/DboSource.php
@@ -857,7 +857,7 @@ public function name($data) {
  * @return bool True if the database is connected, else false
  */
 	public function isConnected() {
-		if (is_null($this->_connection)) {
+		if ($this->_connection === null) {
 			$connected = false;
 		} else {
 			try {