diff --git a/lib/Conversation.class.php b/lib/Conversation.class.php
index 6217e90..33d1495 100644
--- a/lib/Conversation.class.php
+++ b/lib/Conversation.class.php
@@ -4,7 +4,7 @@ require_once('Message.class.php');
 
 function compareMsgDate ($msg1, $msg2) {
 
-	return ($msg1->getDate() < $msg2->getDate()) ? false : true;
+	return ($msg1->getDate() < $msg2->getDate()) ? -1 : 1;
 }
 
 class Conversation {