diff --git a/core/dbobject.class.php b/core/dbobject.class.php
index 8f283c30fa..1de1c5c9ee 100644
--- a/core/dbobject.class.php
+++ b/core/dbobject.class.php
@@ -1983,7 +1983,7 @@ abstract class DBObject implements iDisplay
 				/** @var \AttributeExternalKey $oAtt */
 				$sTargetClass = $oAtt->GetTargetClass();
 				if (false === MetaModel::IsObjectInDB($sTargetClass, $toCheck)) {
-					return "Target object not found (".$sTargetClass.".::".$toCheck.")";
+					return "Target object not found ({$sTargetClass}::{$toCheck})";
 				}
 			}
 			if ($oAtt->IsHierarchicalKey())