diff --git a/lib/filelib.php b/lib/filelib.php
index ef1abdb1a45..62a21df96bc 100644
--- a/lib/filelib.php
+++ b/lib/filelib.php
@@ -613,7 +613,7 @@ function file_get_drafarea_files($draftitemid, $filepath = '/') {
             } else {
                 // do NOT use file browser here!
                 $item->mimetype = get_mimetype_description($file);
-                if (file_mimetype_in_typegroup($item->mimetype, 'archive')) {
+                if (file_extension_in_typegroup($file->get_filename(), 'archive')) {
                     $item->type = 'zip';
                 } else {
                     $item->type = 'file';