diff --git a/sys/sys/_termios.h b/sys/sys/_termios.h
--- a/sys/sys/_termios.h
+++ b/sys/sys/_termios.h
@@ -208,7 +208,15 @@
 #define	B115200	115200
 #define	B230400	230400
 #define	B460800	460800
+#define B500000 500000
 #define	B921600	921600
+#define B1000000	1000000U
+#define B1500000	1500000U
+#define B2000000	2000000U
+#define B2500000	2500000U
+#define B3000000	3000000U
+#define B3500000	3500000U
+#define B4000000	4000000U
 #define	EXTA	19200
 #define	EXTB	38400
 #endif