diff --git a/isatty/isatty_bsd.go b/isatty/isatty_bsd.go
index 07ec1bd..711f288 100644
--- a/isatty/isatty_bsd.go
+++ b/isatty/isatty_bsd.go
@@ -3,6 +3,8 @@
 
 package isatty
 
+import "golang.org/x/sys/unix"
+
 // IsTerminal return true if the file descriptor is terminal.
 func IsTerminal(fd uintptr) bool {
 	_, err := unix.IoctlGetTermios(int(fd), unix.TIOCGETA)