diff --git a/Orange/canvas/application/addons.py b/Orange/canvas/application/addons.py
index d89b3a5aa02..59b1fba383c 100644
--- a/Orange/canvas/application/addons.py
+++ b/Orange/canvas/application/addons.py
@@ -588,7 +588,7 @@ def dropEvent(self, event):
             if path.endswith(self.ADDON_EXTENSIONS):
                 name, vers, summary, descr = (get_meta_from_archive(path) or
                                               (os.path.basename(path), '', '', ''))
-                names.append(name)
+                names.append(cleanup(name))
                 packages.append(
                     Installable(name, vers, summary,
                                 descr or summary, path, [path]))