diff --git a/plugin/vim-ripgrep.vim b/plugin/vim-ripgrep.vim
index 9bc029d..1367ded 100644
--- a/plugin/vim-ripgrep.vim
+++ b/plugin/vim-ripgrep.vim
@@ -145,5 +145,5 @@ fun! s:RgShowRoot()
   endif
 endfun
 
-command! -nargs=* -complete=file Rg :call s:Rg(<q-args>)
-command! -complete=file RgRoot :call s:RgShowRoot()
+command! -nargs=? -complete=file Rg :call s:Rg(<q-args>)
+command! -nargs=? -complete=file RgRoot :call s:RgShowRoot()