diff --git a/core/ormdocument.class.inc.php b/core/ormdocument.class.inc.php
index ee0bc0561..358fc3eea 100644
--- a/core/ormdocument.class.inc.php
+++ b/core/ormdocument.class.inc.php
@@ -314,7 +314,7 @@ class ormDocument
 					'document' => $oDocument,
 					'content_disposition' => $sContentDisposition,
 					);
-				EventService::FireEvent(new EventData(EVENT_DOWNLOAD_DOCUMENT, $sClass, $aEventData));
+				EventService::FireEvent(new EventData(\EVENT_DOWNLOAD_DOCUMENT, $sClass, $aEventData));
 				$oPage->TrashUnexpectedOutput();
 				$oPage->SetContentType($oDocument->GetMimeType());
 				$oPage->SetContentDisposition($sContentDisposition,$oDocument->GetFileName());
diff --git a/datamodels/2.x/itop-attachments/src/Hook/EventListener.php b/datamodels/2.x/itop-attachments/src/Hook/EventListener.php
index 6f8a9bf34..273f9506e 100644
--- a/datamodels/2.x/itop-attachments/src/Hook/EventListener.php
+++ b/datamodels/2.x/itop-attachments/src/Hook/EventListener.php
@@ -33,7 +33,7 @@ class EventListener implements iEventServiceSetup
 	public function RegisterEventsAndListeners()
 	{
 		EventService::RegisterListener(
-			EVENT_DOWNLOAD_DOCUMENT,
+			\EVENT_DOWNLOAD_DOCUMENT,
 			[$this, 'OnAttachmentDownloadActivateTriggers'],
 			'Attachment'
 		);
diff --git a/sources/Core/EventListener/AttributeBlobEventListener.php b/sources/Core/EventListener/AttributeBlobEventListener.php
index f3d75fe2a..4db7ee276 100644
--- a/sources/Core/EventListener/AttributeBlobEventListener.php
+++ b/sources/Core/EventListener/AttributeBlobEventListener.php
@@ -34,7 +34,7 @@ class AttributeBlobEventListener implements iEventServiceSetup
 	public function RegisterEventsAndListeners()
 	{
 		EventService::RegisterListener(
-			EVENT_DOWNLOAD_DOCUMENT,
+			\EVENT_DOWNLOAD_DOCUMENT,
 			[$this, 'OnAttributeBlobDownloadActivateTrigger']
 		);
 	}