diff --git a/main/admin/calendar.php b/main/admin/calendar.php
index d51ea96b99..0a367a8412 100644
--- a/main/admin/calendar.php
+++ b/main/admin/calendar.php
@@ -156,7 +156,7 @@ else
 /* ==============================================================================
   			TRACKING
 ==============================================================================  */
-include('../inc/lib/events.lib.inc.php');
+require_once('../inc/lib/events.lib.inc.php');
 //event_access_tool(TOOL_CALENDAR_EVENT);
 
 /* ==============================================================================
diff --git a/main/chat/chat.php b/main/chat/chat.php
index eb92ad67b0..883418bb81 100644
--- a/main/chat/chat.php
+++ b/main/chat/chat.php
@@ -1,4 +1,4 @@
-<?php // $Id: chat.php 18206 2009-02-03 20:19:12Z cfasanando $
+<?php // $Id: chat.php 18433 2009-02-11 14:58:51Z cvargas1 $
 /*
 ==============================================================================
 	Dokeos - elearning and course management software
@@ -46,7 +46,7 @@ else
 /* ============================================================================== 
   			TRACKING
 ==============================================================================  */
-include('../inc/lib/events.lib.inc.php');
+require_once('../inc/lib/events.lib.inc.php');
 event_access_tool(TOOL_CHAT);
 
 
diff --git a/main/glossary/index.php b/main/glossary/index.php
index 82ec1cfdc0..171fe89a3e 100755
--- a/main/glossary/index.php
+++ b/main/glossary/index.php
@@ -11,7 +11,7 @@ $language_file = array('glossary');
 
 // including the global dokeos file
 require_once('../inc/global.inc.php');
-include('../inc/lib/events.lib.inc.php');
+require_once('../inc/lib/events.lib.inc.php');
 
 // the section (tabs)
 $this_section=SECTION_COURSES;
diff --git a/main/notebook/index.php b/main/notebook/index.php
index 55f97f0a50..eb98f19db1 100755
--- a/main/notebook/index.php
+++ b/main/notebook/index.php
@@ -13,7 +13,7 @@ $language_file = array('notebook');
 
 // including the global dokeos file
 require_once('../inc/global.inc.php');
-include('../inc/lib/events.lib.inc.php');
+require_once('../inc/lib/events.lib.inc.php');
 
 // the section (tabs)
 $this_section=SECTION_COURSES;
diff --git a/main/online/online.php b/main/online/online.php
index 1aee2e3da9..72ca1fa79f 100644
--- a/main/online/online.php
+++ b/main/online/online.php
@@ -1,4 +1,4 @@
-<?php // $Id: online.php 9246 2006-09-25 13:24:53Z bmol $
+<?php // $Id: online.php 18433 2009-02-11 14:58:51Z cvargas1 $
 /*
 ==============================================================================
 	Dokeos - elearning and course management software
@@ -35,7 +35,7 @@ api_protect_course_script();
 /* ============================================================================== 
   			TRACKING
 ==============================================================================  */
-include('../inc/lib/events.lib.inc.php');
+require_once('../inc/lib/events.lib.inc.php');
 event_access_tool(TOOL_CONFERENCE);
 
 ?>