diff --git a/.travis.yml b/.travis.yml
index ba93012..e2b0084 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,7 @@
 language: go
 go:
-  - 1.9.x
+  - 1.9.3
+  - 1.9.4
   - tip
 
 go_import_path: github.com/containerd/console
@@ -15,3 +16,8 @@ script:
   - GOOS=windows go test
   - GOOS=solaris go build
   - GOOS=solaris go test -c
+
+matrix:
+  allow_failures:
+    - go: 1.9.4
+
diff --git a/tc_linux.go b/tc_linux.go
index 80ef2f6..73330eb 100644
--- a/tc_linux.go
+++ b/tc_linux.go
@@ -13,25 +13,21 @@ const (
 	cmdTcSet = unix.TCSETS
 )
 
-func ioctl(fd, flag, data uintptr) error {
-	if _, _, err := unix.Syscall(unix.SYS_IOCTL, fd, flag, data); err != 0 {
-		return err
-	}
-	return nil
-}
-
 // unlockpt unlocks the slave pseudoterminal device corresponding to the master pseudoterminal referred to by f.
 // unlockpt should be called before opening the slave side of a pty.
 func unlockpt(f *os.File) error {
 	var u int32
-	return ioctl(f.Fd(), unix.TIOCSPTLCK, uintptr(unsafe.Pointer(&u)))
+	if _, _, err := unix.Syscall(unix.SYS_IOCTL, f.Fd(), unix.TIOCSPTLCK, uintptr(unsafe.Pointer(&u))); err != 0 {
+		return err
+	}
+	return nil
 }
 
 // ptsname retrieves the name of the first available pts for the given master.
 func ptsname(f *os.File) (string, error) {
-	n, err := unix.IoctlGetInt(int(f.Fd()), unix.TIOCGPTN)
-	if err != nil {
+	var u uint32
+	if _, _, err := unix.Syscall(unix.SYS_IOCTL, f.Fd(), unix.TIOCGPTN, uintptr(unsafe.Pointer(&u))); err != 0 {
 		return "", err
 	}
-	return fmt.Sprintf("/dev/pts/%d", n), nil
+	return fmt.Sprintf("/dev/pts/%d", u), nil
 }