*** fileio.c	02 Oct 2004 16:14:24 +0200	1.515
--- fileio.c	02 Oct 2004 17:01:48 +0200	
***************
*** 5718,5723 ****
--- 5718,5725 ----
        && stat (SDATA (current_buffer->filename), &st) >= 0)
      /* But make sure we can overwrite it later!  */
      auto_save_mode_bits = st.st_mode | 0600;
+   else if (! NILP (current_buffer->filename))
+     auto_save_mode_bits = Ffile_modes (current_buffer->filename) | 0600;
    else
      auto_save_mode_bits = 0666;