diff --git a/onionshare_gui/file_selection.py b/onionshare_gui/file_selection.py
index 270baef7..2a024620 100644
--- a/onionshare_gui/file_selection.py
+++ b/onionshare_gui/file_selection.py
@@ -191,6 +191,7 @@ class FileList(QtWidgets.QListWidget):
         """
         Add a file or directory to this widget.
         """
+        filenames = []
         for index in range(self.count()):
             filenames.append(self.item(index).filename)