diff --git a/plugin/NERD_tree.vim b/plugin/NERD_tree.vim
index 1bd3b9d..5371dc2 100644
--- a/plugin/NERD_tree.vim
+++ b/plugin/NERD_tree.vim
@@ -1948,7 +1948,7 @@ endfunction
 function! s:Path.delete()
     if self.isDirectory
 
-        let cmd = g:NERDTreeRemoveDirCmd . self.str('escape': 1})
+        let cmd = g:NERDTreeRemoveDirCmd . self.str({'escape': 1})
         let success = system(cmd)
 
         if v:shell_error != 0