diff --git a/lib/nerdtree/ui.vim b/lib/nerdtree/ui.vim
index c683198..c8482d0 100644
--- a/lib/nerdtree/ui.vim
+++ b/lib/nerdtree/ui.vim
@@ -375,7 +375,7 @@ function! s:UI._stripMarkup(line, removeLeadingSpaces)
     let line = substitute (line, g:NERDTreeUI.MarkupReg(),"","")
 
     "strip off any read only flag
-    exec 'let line = substitute (line, " \['.g:NERDTreeGlyphReadOnly.'\]", "","")'
+    exec 'let line = substitute (line, " \\['.g:NERDTreeGlyphReadOnly.'\\]", "","")'
 
     "strip off any bookmark flags
     let line = substitute (line, ' {[^}]*}', "","")