diff --git a/powerline/matchers/vim/plugin/nerdtree.py b/powerline/matchers/vim/plugin/nerdtree.py
index 3ec423df..d6e9f69d 100644
--- a/powerline/matchers/vim/plugin/nerdtree.py
+++ b/powerline/matchers/vim/plugin/nerdtree.py
@@ -7,7 +7,7 @@ import re
 from powerline.bindings.vim import buffer_name
 
 
-NERD_TREE_RE = re.compile(b'NERD_TREE_\\d+')
+NERD_TREE_RE = re.compile(b'NERD_tree_\\d+')
 
 
 def nerdtree(matcher_info):