diff --git a/clipboard_unix.go b/clipboard_unix.go
index d9f6a56..d370d0e 100644
--- a/clipboard_unix.go
+++ b/clipboard_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build freebsd linux netbsd openbsd solaris dragonfly
+// +build freebsd linux netbsd openbsd solaris dragonfly zos
 
 package clipboard