diff --git a/vimrc b/vimrc
index d53b3d9..b5751d7 100644
--- a/vimrc
+++ b/vimrc
@@ -65,7 +65,7 @@ set nowb
 " ================ Persistent Undo ==================
 " Keep undo history across sessions, by storing in file.
 " Only works all the time.
-if has('persistent_undo') && !isdirectory(expand('~').'/.vim/backups')
+if has('persistent_undo') && isdirectory(expand('~').'/.vim/backups')
   silent !mkdir ~/.vim/backups > /dev/null 2>&1
   set undodir=~/.vim/backups
   set undofile