diff --git a/autoload/fugitive.vim b/autoload/fugitive.vim
index 3fbe727..118572f 100644
--- a/autoload/fugitive.vim
+++ b/autoload/fugitive.vim
@@ -2069,7 +2069,7 @@ function! s:TreeInfo(dir, commit) abort
   if a:commit =~# '^:\=[0-3]$'
     let index = get(s:indexes, key, [])
     let newftime = getftime(fugitive#Find('.git/index', a:dir))
-    if get(index, 0, -1) < newftime
+    if get(index, 0, -2) < newftime
       let [lines, exec_error] = s:LinesError([a:dir, 'ls-files', '--stage', '--'])
       let s:indexes[key] = [newftime, {'0': {}, '1': {}, '2': {}, '3': {}}]
       if exec_error