diff --git a/system/core/Config.php b/system/core/Config.php
index e7cbe56..109ee64 100644
--- a/system/core/Config.php
+++ b/system/core/Config.php
@@ -202,13 +202,13 @@
 	 * Fetch a config file item with slash appended (if not empty)
 	 *
 	 * @param	string		$item	Config item name
-	 * @return	string|bool	The configuration item or FALSE on failure
+	 * @return	string|null	The configuration item or NULL if the item doesn't exist
 	 */
 	public function slash_item($item)
 	{
 		if ( ! isset($this->config[$item]))
 		{
-			return FALSE;
+			return NULL;
 		}
 		elseif (trim($this->config[$item]) === '')
 		{
diff --git a/tests/codeigniter/core/Config_test.php b/tests/codeigniter/core/Config_test.php
index 72f47cd..ba9a2c0 100644
--- a/tests/codeigniter/core/Config_test.php
+++ b/tests/codeigniter/core/Config_test.php
@@ -46,7 +46,7 @@
 	public function test_slash_item()
 	{
 		// Bad Config value
-		$this->assertFalse($this->config->slash_item('no_good_item'));
+		$this->assertNull($this->config->slash_item('no_good_item'));
 
 		$this->assertEquals($this->cfg['base_url'], $this->config->slash_item('base_url'));
 		$this->assertEquals($this->cfg['subclass_prefix'].'/', $this->config->slash_item('subclass_prefix'));