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-rw-r--r--libio/iosetbuffer.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libio/iosetbuffer.c b/libio/iosetbuffer.c
index d119cd0..5acbf5e 100644
--- a/libio/iosetbuffer.c
+++ b/libio/iosetbuffer.c
@@ -38,7 +38,7 @@ _IO_setbuffer (fp, buf, size)
if (!buf)
size = 0;
(void) _IO_SETBUF (fp, buf, size);
- if (fp->_mode == 0)
+ if (fp->_vtable_offset == 0 && fp->_mode == 0)
/* We also have to set the buffer using the wide char function. */
(*fp->_wide_data->_wide_vtable->__setbuf) (fp, buf, size);
_IO_funlockfile (fp);