diff --git a/macli.py b/macli.py
index 7ad906e..9424aa2 100644
--- a/macli.py
+++ b/macli.py
@@ -86,6 +86,9 @@ def archive(content, base_url, selector, directory, attribute, progbar):
         if attribute not in part.attrs:
             continue
 
+        if part[attribute].startswith('data:'):
+            continue
+
         href = urllib.parse.urljoin(base_url, part[attribute],
                                     allow_fragments=False)
         progbar.next_iter(href)