diff --git a/mmap_unix.go b/mmap_unix.go
index 25b13e5..9993cca 100644
--- a/mmap_unix.go
+++ b/mmap_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 darwin dragonfly freebsd linux openbsd solaris netbsd
+// +build aix darwin dragonfly freebsd linux openbsd solaris netbsd
 
 package mmap