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-rw-r--r--libio/iofwrite.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/libio/iofwrite.c b/libio/iofwrite.c
index b8f02f2dd0..0bbeef2646 100644
--- a/libio/iofwrite.c
+++ b/libio/iofwrite.c
@@ -36,7 +36,9 @@ _IO_fwrite (buf, size, count, fp)
   CHECK_FILE (fp, 0);
   if (request == 0)
     return 0;
+  _IO_flockfile (fp);
   written = _IO_sputn (fp, (const char *) buf, request);
+  _IO_funlockfile (fp);
   /* Many traditional implementations return 0 if size==0 && count > 0,
      but ANSI seems to require us to return count in this case. */
   if (written == request)