diff --git a/assets/javascripts/attachments_dmsf.js b/assets/javascripts/attachments_dmsf.js
index e4e30cdb..42f90733 100644
--- a/assets/javascripts/attachments_dmsf.js
+++ b/assets/javascripts/attachments_dmsf.js
@@ -52,7 +52,7 @@ function dmsfAddFile(inputEl, file, eagerUpload) {
     let attachments = $('#dmsf_attachments_fields');
     let max = ($(inputEl).attr('multiple') == 'multiple') ? 10 : 1
 
-    if (attachments.children.length < max) {
+    if (attachments.children().length < max) {
 
         let attachmentId = dmsfAddFile.nextAttachmentId++;
         let fileSpan = $('<span>', { id: 'dmsf_attachments_' + attachmentId, 'class': 'attachment' });