diff --git a/syslog/example_test.go b/syslog/example_test.go
index ff2220d..558f17a 100644
--- a/syslog/example_test.go
+++ b/syslog/example_test.go
@@ -1,3 +1,7 @@
+// +build !windows
+// +build !plan9
+// +build !nacl
+
 package syslog_test
 
 import (
diff --git a/syslog/syslog.go b/syslog/syslog.go
index 91c3f18..f5b8aa1 100644
--- a/syslog/syslog.go
+++ b/syslog/syslog.go
@@ -1,3 +1,7 @@
+// +build !windows
+// +build !plan9
+// +build !nacl
+
 package syslog
 
 import (
diff --git a/syslog/syslog_test.go b/syslog/syslog_test.go
index aa9c2cb..be77dfe 100644
--- a/syslog/syslog_test.go
+++ b/syslog/syslog_test.go
@@ -1,3 +1,7 @@
+// +build !windows
+// +build !plan9
+// +build !nacl
+
 package syslog
 
 import (
diff --git a/term/colorwriter_windows.go b/term/colorwriter_windows.go
index fcacda3..b27a036 100644
--- a/term/colorwriter_windows.go
+++ b/term/colorwriter_windows.go
@@ -1,7 +1,5 @@
 // The code in this file is adapted from github.com/mattn/go-colorable.
 
-// +build windows
-
 package term
 
 import (
diff --git a/term/terminal_windows_test.go b/term/terminal_windows_test.go
index b6da8e3..789cc28 100644
--- a/term/terminal_windows_test.go
+++ b/term/terminal_windows_test.go
@@ -6,8 +6,6 @@ import (
 	"testing"
 )
 
-// +build windows
-
 type myWriter struct {
 	fd uintptr
 }