diff --git a/state.py b/state.py
index f5be070..cf0c643 100644
--- a/state.py
+++ b/state.py
@@ -298,7 +298,8 @@ class File(object):
             return STAMP_DIR
         else:
             # a "unique identifier" stamp for a regular file
-            return str((st.st_ctime, st.st_mtime, st.st_size, st.st_ino))
+            return str((st.st_mtime, st.st_size, st.st_ino,
+                        st.st_mode, st.st_uid, st.st_gid))
 
     def nicename(self):
         return relpath(os.path.join(vars.BASE, self.name), vars.STARTDIR)