diff --git a/cwriter/util_zos.go b/cwriter/util_zos.go
new file mode 100644
index 0000000..b7d67fc
--- /dev/null
+++ b/cwriter/util_zos.go
@@ -0,0 +1,7 @@
+// +build zos
+
+package cwriter
+
+import "golang.org/x/sys/unix"
+
+const ioctlReadTermios = unix.TCGETS