diff --git a/unix/serial.fs b/unix/serial.fs
index 27960e6..4ae1611 100644
--- a/unix/serial.fs
+++ b/unix/serial.fs
@@ -16,6 +16,7 @@ c-library serial
     c-function fdopen fdopen n a -- a ( fd mode -- file )
     c-function read read n a n -- n ( fd addr u -- u' )
     c-function write write n a n -- n ( fd addr u -- u' )
+    c-function close close n -- n ( fd -- r )
 end-c-library
 
 [IFDEF] android
@@ -84,6 +85,8 @@ base @ 8 base !
 000000010017 Constant CBAUD
 000000000001 Constant IGNBRK
 000000000004 Constant IGNPAR
+000000000400 Constant NOCTTY
+000000004000 Constant NODELAY
 base !
 
 5 Constant VTIME
@@ -102,7 +105,7 @@ $541B Constant FIONREAD
     r> 0 t_buf tcsetattr drop ;
 
 : reset-baud ( fd -- )
-    t_old 0 rot tcsetattr drop ;
+    0 t_old tcsetattr drop ;
 
 : check-read ( fd -- n )  >r
     0 sp@ r> fileno FIONREAD rot ioctl drop ;