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-rw-r--r--libio/ftello64.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/libio/ftello64.c b/libio/ftello64.c
index 96eeb184a4..621454974e 100644
--- a/libio/ftello64.c
+++ b/libio/ftello64.c
@@ -38,6 +38,8 @@ ftello64 (fp)
   _IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, fp);
   _IO_flockfile (fp);
   pos = _IO_seekoff (fp, 0, _IO_seek_cur, 0);
+  if (_IO_in_backup (fp))
+    pos -= fp->_IO_save_end - fp->_IO_save_base;
   _IO_funlockfile (fp);
   _IO_cleanup_region_end (0);
   if (pos == _IO_pos_BAD)