diff --git a/datamodels/2.x/itop-portal-base/portal/public/js/toolbox.js b/datamodels/2.x/itop-portal-base/portal/public/js/toolbox.js
index 1d572dbda8..55b92f7035 100644
--- a/datamodels/2.x/itop-portal-base/portal/public/js/toolbox.js
+++ b/datamodels/2.x/itop-portal-base/portal/public/js/toolbox.js
@@ -109,7 +109,7 @@ var CombodoPortalToolbox = {
 
 			// Force modal to have an HTML ID, otherwise it can lead to complications, especially with the portal_leave_handle.js
 			// See N°3469
-			let sModalID = (oOptions.id !== null) ? oOptions.id : 'modal-with-generated-id-'+Date.now();
+			var sModalID = (oOptions.id !== null) ? oOptions.id : 'modal-with-generated-id-'+Date.now();
 			oModalElem.attr('id', sModalID)
 				.appendTo('body');
 		}