diff --git a/library/ZendAfi/View/Helper/Telephone/RenderAlbum.php b/library/ZendAfi/View/Helper/Telephone/RenderAlbum.php
index c82e861e15cb0ba0617b02aefa9b467ea9661939..3a4aa2eedc9b7704cc273016e982fd9c67d1d9cd 100644
--- a/library/ZendAfi/View/Helper/Telephone/RenderAlbum.php
+++ b/library/ZendAfi/View/Helper/Telephone/RenderAlbum.php
@@ -20,9 +20,9 @@
  */
 
 class ZendAfi_View_Helper_Telephone_RenderAlbum extends ZendAfi_View_Helper_RenderAlbum {
-  public function renderAlbum($album) {
+  public function renderAlbum($album) : string {
     return $album
       ? sprintf('<div id="resnum">%s</div>', $this->renderAlbumHelper($album))
       : $this->view->_('Aucune ressource numérique trouvée.');
   }
-}
\ No newline at end of file
+}