diff --git a/src/cmd/link/internal/ld/outbuf_mmap.go b/src/cmd/link/internal/ld/outbuf_mmap.go
index e6ee041abb..f5ccfc9584 100644
--- a/src/cmd/link/internal/ld/outbuf_mmap.go
+++ b/src/cmd/link/internal/ld/outbuf_mmap.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
+// +build aix darwin dragonfly freebsd linux netbsd openbsd
 
 package ld
 
diff --git a/src/cmd/link/internal/ld/outbuf_nommap.go b/src/cmd/link/internal/ld/outbuf_nommap.go
index 51218d8ae7..bad01dc6d5 100644
--- a/src/cmd/link/internal/ld/outbuf_nommap.go
+++ b/src/cmd/link/internal/ld/outbuf_nommap.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,!windows
+// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!windows
 
 package ld
 
diff --git a/src/cmd/link/internal/ld/outbuf_test.go b/src/cmd/link/internal/ld/outbuf_test.go
index d8c21426b3..db0a92485e 100644
--- a/src/cmd/link/internal/ld/outbuf_test.go
+++ b/src/cmd/link/internal/ld/outbuf_test.go
@@ -17,7 +17,7 @@ func TestMMap(t *testing.T) {
 	switch runtime.GOOS {
 	default:
 		t.Skip("unsupported OS")
-	case "darwin", "dragonfly", "freebsd", "linux", "openbsd", "windows":
+	case "aix", "darwin", "dragonfly", "freebsd", "linux", "netbsd", "openbsd", "windows":
 	}
 	dir, err := ioutil.TempDir("", "TestMMap")
 	if err != nil {