diff --git a/after/ftplugin/python.vim b/after/ftplugin/python.vim
index a0bc092..67eb0c8 100644
--- a/after/ftplugin/python.vim
+++ b/after/ftplugin/python.vim
@@ -1,3 +1,3 @@
 if exists(':AsyncRun')
-    nnoremap <silent> <F9> :AsyncRun python "%"<CR>
+    nnoremap <silent> <F9> :AsyncRun python -u "%"<CR>
 endif