diff --git a/autoload/fzf/vim.vim b/autoload/fzf/vim.vim
index cf6f3db..c51d27c 100644
--- a/autoload/fzf/vim.vim
+++ b/autoload/fzf/vim.vim
@@ -78,7 +78,7 @@ endfunction
 function! fzf#vim#with_preview(...)
   " Default options
   let options = {}
-  let window = 'right'
+  let window = ''
 
   let args = copy(a:000)
 
@@ -100,7 +100,11 @@ function! fzf#vim#with_preview(...)
     call remove(args, 0)
   endif
 
-  let preview = ['--preview-window', window, '--preview', (s:is_win ? s:bin.preview : fzf#shellescape(s:bin.preview)).' '.placeholder]
+  let preview = []
+  if len(window)
+    let preview += ['--preview-window', window]
+  endif
+  let preview += ['--preview', (s:is_win ? s:bin.preview : fzf#shellescape(s:bin.preview)).' '.placeholder]
 
   if len(args)
     call extend(preview, ['--bind', join(map(args, 'v:val.":toggle-preview"'), ',')])