diff --git a/unix/cap_freebsd.go b/unix/cap_freebsd.go
index 83b6bcea..66a95c2f 100644
--- a/unix/cap_freebsd.go
+++ b/unix/cap_freebsd.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
+// +build freebsd,amd64
 
 package unix