diff --git a/dashboard/builder/filemutex_flock.go b/dashboard/builder/filemutex_flock.go
index 3c1d655f..68851b8d 100644
--- a/dashboard/builder/filemutex_flock.go
+++ b/dashboard/builder/filemutex_flock.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 linux darwin freebsd
+// +build darwin dragonfly freebsd linux netbsd openbsd
 
 package main
 
diff --git a/dashboard/builder/filemutex_local.go b/dashboard/builder/filemutex_local.go
index 36248f72..68cfb62f 100644
--- a/dashboard/builder/filemutex_local.go
+++ b/dashboard/builder/filemutex_local.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 netbsd openbsd plan9
+// +build nacl plan9 solaris
 
 package main