diff --git a/system/libraries/Trackback.php b/system/libraries/Trackback.php
index cc93b2e..ea8017e 100644
--- a/system/libraries/Trackback.php
+++ b/system/libraries/Trackback.php
@@ -212,7 +212,7 @@
 	public function send_error($message = 'Incomplete Information')
 	{
 		echo '<?xml version="1.0" encoding="utf-8"?'.">\n<response>\n<error>1</error>\n<message>".$message."</message>\n</response>";
-		exit(0);
+		exit(EXIT_SUCCESS);
 	}
 
 	// --------------------------------------------------------------------
@@ -228,7 +228,7 @@
 	public function send_success()
 	{
 		echo '<?xml version="1.0" encoding="utf-8"?'.">\n<response>\n<error>0</error>\n</response>";
-		exit(0);
+		exit(EXIT_SUCCESS);
 	}
 
 	// --------------------------------------------------------------------