diff --git a/htdocs/admin/agenda_extsites.php b/htdocs/admin/agenda_extsites.php
index 371854410b0..375d0af3adf 100644
--- a/htdocs/admin/agenda_extsites.php
+++ b/htdocs/admin/agenda_extsites.php
@@ -1,6 +1,7 @@
 <?php
-/* Copyright (C) 2008-2011 Laurent Destailleur  <eldy@users.sourceforge.net>
- * Copyright (C) 2011-2014 Juanjo Menent        <jmenent@2byte.es>
+/* Copyright (C) 2008-2011  Laurent Destailleur <eldy@users.sourceforge.net>
+ * Copyright (C) 2011-2014  Juanjo Menent       <jmenent@2byte.es>
+ * Copyright (C) 2016       Raphaël Doursenaud  <rdoursenaud@gpcsolutions.fr>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -88,7 +89,7 @@ if ($actionsave)
 	// Save nb of agenda
 	if (! $error)
 	{
-		$res=dolibarr_set_const($db,'AGENDA_EXT_NB',trim(GETPOST('AGENDA_EXT_NB','alpha')),'chaine',0,'',$conf->entity);
+		$res=dolibarr_set_const($db,'AGENDA_EXT_NB',trim(GETPOST('AGENDA_EXT_NB','int')),'chaine',0,'',$conf->entity);
 		if (! $res > 0) $error++;
 		if (empty($conf->global->AGENDA_EXT_NB)) $conf->global->AGENDA_EXT_NB=5;
 		$MAXAGENDA=empty($conf->global->AGENDA_EXT_NB)?5:$conf->global->AGENDA_EXT_NB;
@@ -201,9 +202,9 @@ while ($i <= $MAXAGENDA)
 	// Nb
 	print '<td width="180" class="nowrap">'.$langs->trans("AgendaExtNb",$key)."</td>";
 	// Name
-	print '<td><input type="text" class="flat hideifnotset" name="agenda_ext_name'.$key.'" value="'. (GETPOST('agenda_ext_name'.$key)?GETPOST('agenda_ext_name'.$key):$conf->global->$name) . '" size="28"></td>';
+	print '<td><input type="text" class="flat hideifnotset" name="agenda_ext_name'.$key.'" value="'. (GETPOST('agenda_ext_name'.$key)?GETPOST('agenda_ext_name'.$key, 'alpha'):$conf->global->$name) . '" size="28"></td>';
 	// URL
-	print '<td><input type="url" class="flat hideifnotset" name="agenda_ext_src'.$key.'" value="'. (GETPOST('agenda_ext_src'.$key)?GETPOST('agenda_ext_src'.$key):$conf->global->$src) . '" size="60"></td>';
+	print '<td><input type="url" class="flat hideifnotset" name="agenda_ext_src'.$key.'" value="'. (GETPOST('agenda_ext_src'.$key)?GETPOST('agenda_ext_src'.$key, 'alpha'):$conf->global->$src) . '" size="60"></td>';
 	// Color (Possible colors are limited by Google)
 	print '<td class="nowrap" align="right">';
 	//print $formadmin->selectColor($conf->global->$color, "google_agenda_color".$key, $colorlist);