diff --git a/src/pkg/os/user/lookup_stubs.go b/src/pkg/os/user/lookup_stubs.go
index ea01f9683d7..42fa557445f 100644
--- a/src/pkg/os/user/lookup_stubs.go
+++ b/src/pkg/os/user/lookup_stubs.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 nocgo
+// +build nocgo windows
 
 package user