diff --git a/setup/wizard.php b/setup/wizard.php
index fbc95f9ac1..e1c77f4c73 100644
--- a/setup/wizard.php
+++ b/setup/wizard.php
@@ -59,6 +59,8 @@ if (!function_exists('json_decode'))
 	}
 }
 /////////////////////////////////////////////////////////////////////
+//N°3671 setup context: force $bForceTrustProxy to be persisted in next calls
+utils::GetAbsoluteUrlAppRoot(true);
 
 $oWizard = new WizardController('WizStepWelcome');
 $oWizard->Run();