diff --git a/serial_posix.go b/serial_posix.go
index 311e7f6..6d25b2d 100644
--- a/serial_posix.go
+++ b/serial_posix.go
@@ -173,9 +173,9 @@ func newTermios(c *Config) (termios *syscall.Termios, err error) {
 	}
 	termios.Cflag |= flag
 	// Input baud.
-	termios.Ispeed = flag
+	cfSetIspeed(termios, flag)
 	// Output baud.
-	termios.Ospeed = flag
+	cfSetOspeed(termios, flag)
 	// Character size.
 	if c.DataBits == 0 {
 		flag = syscall.CS8
diff --git a/termios_bsd.go b/termios_bsd.go
new file mode 100644
index 0000000..17016a7
--- /dev/null
+++ b/termios_bsd.go
@@ -0,0 +1,15 @@
+// +build freebsd openbsd netbsd
+
+package serial
+
+import (
+	"syscall"
+)
+
+func cfSetIspeed(termios *syscall.Termios, speed uint32) {
+	termios.Ispeed = speed
+}
+
+func cfSetOspeed(termios *syscall.Termios, speed uint32) {
+	termios.Ospeed = speed
+}
diff --git a/termios_darwin.go b/termios_darwin.go
new file mode 100644
index 0000000..209872e
--- /dev/null
+++ b/termios_darwin.go
@@ -0,0 +1,13 @@
+package serial
+
+import (
+	"syscall"
+)
+
+func cfSetIspeed(termios *syscall.Termios, speed uint64) {
+	termios.Ispeed = speed
+}
+
+func cfSetOspeed(termios *syscall.Termios, speed uint64) {
+	termios.Ospeed = speed
+}
diff --git a/termios_linux.go b/termios_linux.go
new file mode 100644
index 0000000..4e091ea
--- /dev/null
+++ b/termios_linux.go
@@ -0,0 +1,15 @@
+// +build !mips,!mipsle,!mips64,!mips64le
+
+package serial
+
+import (
+	"syscall"
+)
+
+func cfSetIspeed(termios *syscall.Termios, speed uint32) {
+	termios.Ispeed = speed
+}
+
+func cfSetOspeed(termios *syscall.Termios, speed uint32) {
+	termios.Ospeed = speed
+}
diff --git a/termios_mipsx.go b/termios_mipsx.go
new file mode 100644
index 0000000..88c0b32
--- /dev/null
+++ b/termios_mipsx.go
@@ -0,0 +1,16 @@
+// +build linux
+// +build mips mipsle mips64 mips64le
+
+package serial
+
+import (
+	"syscall"
+)
+
+func cfSetIspeed(termios *syscall.Termios, speed uint32) {
+	// MIPS has no Ispeed field in termios.
+}
+
+func cfSetOspeed(termios *syscall.Termios, speed uint32) {
+	// MIPS has no Ospeed field in termios.
+}