diff --git a/htdocs/install/upgrade.php b/htdocs/install/upgrade.php
index 298edb43f2c..5d9665b218b 100644
--- a/htdocs/install/upgrade.php
+++ b/htdocs/install/upgrade.php
@@ -27,7 +27,7 @@
 include_once("./inc.php");
 if (! file_exists($conffile))
 {
-	print 'Error: Dolibarr config file was not found. This may means that Dolibarr is not installed yet. Please call the page "/install/install.php" instead of "/install/upgrade.php").';
+	print 'Error: Dolibarr config file was not found. This may means that Dolibarr is not installed yet. Please call the page "/install/index.php" instead of "/install/upgrade.php").';
 }
 require_once($conffile); if (! isset($dolibarr_main_db_type)) $dolibarr_main_db_type='mysql';	// For backward compatibility
 require_once($dolibarr_main_document_root."/lib/databases/".$dolibarr_main_db_type.".lib.php");
@@ -80,7 +80,7 @@ if (! isset($_GET["action"]) || preg_match('/upgrade/i',$_GET["action"]))
 
 	if (! $versionfrom && ! $versionto)
 	{
-		print '<div class="error">Parameter versionfrom or version to missing. Upgrade is launched from page install/install.php (like a first install) instead of install/upgrade.php</div>';
+		print '<div class="error">Parameter versionfrom or version to missing. Upgrade is launched from page install/index.php (like a first install) instead of install/upgrade.php</div>';
 		exit;
 	}
 
diff --git a/htdocs/install/upgrade2.php b/htdocs/install/upgrade2.php
index e2ca496fb71..8bec175a4d1 100644
--- a/htdocs/install/upgrade2.php
+++ b/htdocs/install/upgrade2.php
@@ -28,7 +28,7 @@
 include_once('./inc.php');
 if (! file_exists($conffile))
 {
-	print 'Error: Dolibarr config file was not found. This may means that Dolibarr is not installed yet. Please call the page "/install/install.php" instead of "/install/upgrade.php").';
+	print 'Error: Dolibarr config file was not found. This may means that Dolibarr is not installed yet. Please call the page "/install/index.php" instead of "/install/upgrade.php").';
 }
 require_once($conffile); if (! isset($dolibarr_main_db_type)) $dolibarr_main_db_type='mysql';	// For backward compatibility
 require_once($dolibarr_main_document_root . "/lib/databases/".$dolibarr_main_db_type.".lib.php");