diff --git a/python/packages/ai/teams/app.py b/python/packages/ai/teams/app.py
index 499194837..ebd692fff 100644
--- a/python/packages/ai/teams/app.py
+++ b/python/packages/ai/teams/app.py
@@ -751,7 +751,7 @@ async def _handle_file_downloads(self, context: TurnContext, state):
             input_files = state.temp.input_files if state.temp.input_files else []
             for file_downloader in self._options.file_downloaders:
                 files = await file_downloader.download_files(context)
-                input_files.append(*files)
+                input_files.extend(files)
             state.temp.input_files = input_files
 
     async def _run_ai_chain(self, context: TurnContext, state):