diff --git a/constants_zos.go b/constants_zos.go
new file mode 100644
index 0000000..4262f03
--- /dev/null
+++ b/constants_zos.go
@@ -0,0 +1,8 @@
+package termenv
+
+import "golang.org/x/sys/unix"
+
+const (
+	tcgetattr = unix.TCGETS
+	tcsetattr = unix.TCSETS
+)
diff --git a/termenv_posix.go b/termenv_posix.go
index b2109b7..c971dd9 100644
--- a/termenv_posix.go
+++ b/termenv_posix.go
@@ -1,5 +1,5 @@
-//go:build darwin || dragonfly || freebsd || linux || netbsd || openbsd
-// +build darwin dragonfly freebsd linux netbsd openbsd
+//go:build darwin || dragonfly || freebsd || linux || netbsd || openbsd || zos
+// +build darwin dragonfly freebsd linux netbsd openbsd zos
 
 package termenv
 
diff --git a/termenv_unix.go b/termenv_unix.go
index 847fa9b..d38cb27 100644
--- a/termenv_unix.go
+++ b/termenv_unix.go
@@ -1,5 +1,5 @@
-//go:build darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+//go:build darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
+// +build darwin dragonfly freebsd linux netbsd openbsd solaris zos
 
 package termenv