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-rw-r--r--libio/iosetvbuf.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/libio/iosetvbuf.c b/libio/iosetvbuf.c
index 3776330a88..8ba9753efc 100644
--- a/libio/iosetvbuf.c
+++ b/libio/iosetvbuf.c
@@ -42,7 +42,7 @@ _IO_setvbuf (fp, buf, mode, size)
   switch (mode)
     {
     case _IOFBF:
-      fp->_IO_file_flags &= ~_IO_LINE_BUF;
+      fp->_IO_file_flags &= ~_IO_LINE_BUF|_IO_UNBUFFERED;
       if (buf == NULL)
 	{
 	  if (fp->_IO_buf_base == NULL)
@@ -72,6 +72,7 @@ _IO_setvbuf (fp, buf, mode, size)
 	}
       break;
     case _IOLBF:
+      fp->_IO_file_flags &= ~_IO_UNBUFFERED;
       fp->_IO_file_flags |= _IO_LINE_BUF;
       if (buf == NULL)
 	{