diff --git a/unix/dev_darwin_test.go b/unix/dev_darwin_test.go
index 48d04486..bf1adf3a 100644
--- a/unix/dev_darwin_test.go
+++ b/unix/dev_darwin_test.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build go1.7
+
 package unix_test
 
 import (
diff --git a/unix/dev_dragonfly_test.go b/unix/dev_dragonfly_test.go
index 2caba08a..9add3766 100644
--- a/unix/dev_dragonfly_test.go
+++ b/unix/dev_dragonfly_test.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build go1.7
+
 package unix_test
 
 import (
diff --git a/unix/dev_linux_test.go b/unix/dev_linux_test.go
index 6e001f37..2fd3eadd 100644
--- a/unix/dev_linux_test.go
+++ b/unix/dev_linux_test.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build go1.7
+
 package unix_test
 
 import (
diff --git a/unix/dev_netbsd_test.go b/unix/dev_netbsd_test.go
index c39a80a4..24a7e171 100644
--- a/unix/dev_netbsd_test.go
+++ b/unix/dev_netbsd_test.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build go1.7
+
 package unix_test
 
 import (
diff --git a/unix/dev_openbsd_test.go b/unix/dev_openbsd_test.go
index 5635d271..e6cb64ff 100644
--- a/unix/dev_openbsd_test.go
+++ b/unix/dev_openbsd_test.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build go1.7
+
 package unix_test
 
 import (
diff --git a/unix/dev_solaris_test.go b/unix/dev_solaris_test.go
index db58c0d0..656508c9 100644
--- a/unix/dev_solaris_test.go
+++ b/unix/dev_solaris_test.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build go1.7
+
 package unix_test
 
 import (