diff --git a/src/system/libroot/posix/glibc/libio/stdfiles.c b/src/system/libroot/posix/glibc/libio/stdfiles.c
index d74fa1c412..1f43b29c4f 100644
--- a/src/system/libroot/posix/glibc/libio/stdfiles.c
+++ b/src/system/libroot/posix/glibc/libio/stdfiles.c
@@ -69,11 +69,9 @@
 //# endif
 #endif
 
-// ToDo: stdin/stdout were originally buffered
-// (and probably automatically switched to unbuffered for TTYs)
-DEF_STDFILE(_IO_2_1_stdin_, 0, 0, _IO_NO_WRITES + _IO_UNBUFFERED);
-DEF_STDFILE(_IO_2_1_stdout_, 1, &_IO_2_1_stdin_, _IO_NO_READS + _IO_UNBUFFERED);
-DEF_STDFILE(_IO_2_1_stderr_, 2, &_IO_2_1_stdout_, _IO_NO_READS + _IO_UNBUFFERED);
+DEF_STDFILE(_IO_2_1_stdin_, 0, 0, _IO_NO_WRITES);
+DEF_STDFILE(_IO_2_1_stdout_, 1, &_IO_2_1_stdin_, _IO_NO_READS);
+DEF_STDFILE(_IO_2_1_stderr_, 2, &_IO_2_1_stdout_, _IO_NO_READS+_IO_UNBUFFERED);
 
 struct _IO_FILE_plus *_IO_list_all = &_IO_2_1_stderr_;
 INTVARDEF(_IO_list_all)