diff --git a/htdocs/install/check.php b/htdocs/install/check.php
index 34efffe38e2..e774dbd3f5c 100644
--- a/htdocs/install/check.php
+++ b/htdocs/install/check.php
@@ -39,8 +39,8 @@ $langs->load("install");
 // Init "forced values" to nothing. "forced values" are used after an doliwamp install wizard.
 if (! isset($force_install_dolibarrlogin))     $force_install_dolibarrlogin='';
 $useforcedwizard=false;
-if (file_exists("./install.forced.php")) { $useforcedwizard=true; include_once("./install.forced.php"); }
-else if (file_exists("/etc/dolibarr/install.forced.php")) { $useforcedwizard=include_once("/etc/dolibarr/install.forced.php"); }
+if (@file_exists("./install.forced.php")) { $useforcedwizard=true; include_once("./install.forced.php"); }
+else if (@file_exists("/etc/dolibarr/install.forced.php")) { $useforcedwizard=include_once("/etc/dolibarr/install.forced.php"); }
 
 dolibarr_install_syslog("Dolibarr install/upgrade process started");