diff --git a/htdocs/core/js/lib_head.js.php b/htdocs/core/js/lib_head.js.php
index 1aa9c458e39..cf8d641893a 100644
--- a/htdocs/core/js/lib_head.js.php
+++ b/htdocs/core/js/lib_head.js.php
@@ -918,7 +918,7 @@ function document_preview(file, type, title)
 		{
 			optionsbuttons = {
 			    "<?php echo dol_escape_js($langs->transnoentitiesnoconv("OriginalSize")); ?>": function() { console.log("Click on original size"); jQuery(".ui-dialog-content.ui-widget-content > object").css({ "max-height": "none" }); },
-				"<?php echo dol_escape_js($langs->transnoentitiesnoconv("Close")); ?>": function() { $( this ).dialog( "close" ); }
+				"<?php echo dol_escape_js($langs->transnoentitiesnoconv("CloseWindow")); ?>": function() { $( this ).dialog( "close" ); }
 				};
 		}