diff --git a/lib/nerdtree/creator.vim b/lib/nerdtree/creator.vim
index f6e857d..9775d31 100644
--- a/lib/nerdtree/creator.vim
+++ b/lib/nerdtree/creator.vim
@@ -201,7 +201,7 @@ endfunction
 "FUNCTION: s:Creator._isBufHidden(nr) {{{1
 function! s:Creator._isBufHidden(nr)
     redir => bufs
-    ls!
+    silent ls!
     redir END
 
     return bufs =~ a:nr . '..h'