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-rw-r--r--libc/stdio/stdio.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/libc/stdio/stdio.c b/libc/stdio/stdio.c
index 1d89bb922..5a2800a05 100644
--- a/libc/stdio/stdio.c
+++ b/libc/stdio/stdio.c
@@ -1773,8 +1773,8 @@ void _stdio_init(void)
{
#ifdef __STDIO_BUFFERS
/* stdin and stdout uses line buffering when connected to a tty. */
- _stdio_streams[0].modeflags &= isatty(0) * __FLAG_LBF;
- _stdio_streams[1].modeflags &= isatty(1) * __FLAG_LBF;
+ _stdio_streams[0].modeflags ^= (1-isatty(0)) * __FLAG_LBF;
+ _stdio_streams[1].modeflags ^= (1-isatty(1)) * __FLAG_LBF;
#endif /* __STDIO_BUFFERS */
#ifndef __UCLIBC__
/* __stdio_term is automatically when exiting if stdio is used.