diff --git a/datamodels/2.x/itop-core-update/src/Controller/UpdateController.php b/datamodels/2.x/itop-core-update/src/Controller/UpdateController.php
index 03dc2d9df..253c2f886 100644
--- a/datamodels/2.x/itop-core-update/src/Controller/UpdateController.php
+++ b/datamodels/2.x/itop-core-update/src/Controller/UpdateController.php
@@ -130,6 +130,7 @@ class UpdateController extends Controller
 		$aParams['sTransactionId'] = $sTransactionId;
 
 		$this->AddSaas('css/backoffice/main.scss');
+		$this->AddSaas('env-'.utils::GetCurrentEnvironment().'/itop-core-update/css/itop-core-update.scss');
 		$this->m_sOperation = 'ConfirmUpdate';
 		$this->DisplaySetupPage($aParams);
 	}
@@ -159,6 +160,7 @@ class UpdateController extends Controller
 		];
 		$this->AddLinkedScript(utils::GetAbsoluteUrlAppRoot().'setup/jquery.progression.js');
 		$this->AddSaas('css/backoffice/main.scss');
+		$this->AddSaas('env-'.utils::GetCurrentEnvironment().'/itop-core-update/css/itop-core-update.scss');
 		$this->m_sOperation = 'UpdateCoreFiles';
 		$this->DisplaySetupPage($aParams);
 	}