diff --git a/ftplugin/ats.vim b/ftplugin/ats.vim
index 8fd73d7..9071bfe 100644
--- a/ftplugin/ats.vim
+++ b/ftplugin/ats.vim
@@ -25,4 +25,4 @@ if g:ats_autoformat == 1
     augroup END
 endif
 
-command Format call AtsFormat()
+command -nargs=0 Format call AtsFormat()