diff --git a/htdocs/install/etape1.php b/htdocs/install/etape1.php
index 6b9f4e9aac1..fcde2204145 100644
--- a/htdocs/install/etape1.php
+++ b/htdocs/install/etape1.php
@@ -30,6 +30,8 @@
 define('DONOTLOADCONF',1);	// To avoid loading conf by file inc.php
 
 include("./inc.php");
+
+$action=GETPOST('action');
 $setuplang=isset($_POST["selectlang"])?$_POST["selectlang"]:(isset($_GET["selectlang"])?$_GET["selectlang"]:'auto');
 $langs->setDefaultLang($setuplang);
 
@@ -78,7 +80,7 @@ $main_data_dir=isset($_POST["main_data_dir"])?$_POST["main_data_dir"]:'';
 if (! $main_data_dir) { $main_data_dir="$main_dir/documents"; }
 
 
-if ($_POST["action"] == "set")
+if ($action == "set")
 {
 	umask(0);
 	foreach($_POST as $cle=>$valeur)
diff --git a/htdocs/install/etape2.php b/htdocs/install/etape2.php
index 1f24c3dcb45..c7db541859f 100644
--- a/htdocs/install/etape2.php
+++ b/htdocs/install/etape2.php
@@ -41,6 +41,7 @@ error_reporting(0);		// Disable all errors
 @set_time_limit(300);	// Need more than 240 on Windows 7/64
 error_reporting($err);
 
+$action=GETPOST('action');
 $setuplang=isset($_POST["selectlang"])?$_POST["selectlang"]:(isset($_GET["selectlang"])?$_GET["selectlang"]:'auto');
 $langs->setDefaultLang($setuplang);
 
@@ -72,7 +73,7 @@ if (! is_writable($conffile))
     exit;
 }
 
-if ($_POST["action"] == "set")
+if ($action == "set")
 {
 	print '<h3>'.$langs->trans("Database").'</h3>';