diff --git a/src/pkg/syscall/types_darwin.go b/src/pkg/syscall/types_darwin.go
index 424f94e690..b9c65e3c78 100644
--- a/src/pkg/syscall/types_darwin.go
+++ b/src/pkg/syscall/types_darwin.go
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build ignore
+
 /*
 Input to cgo -godefs.  See also mkerrors.sh and mkall.sh
 */
 
-// +build ignore
-
 // +godefs map struct_in_addr [4]byte /* in_addr */
 // +godefs map struct_in6_addr [16]byte /* in6_addr */
 
diff --git a/src/pkg/syscall/types_freebsd.go b/src/pkg/syscall/types_freebsd.go
index f54b6c4e6c..6e1dd4310a 100644
--- a/src/pkg/syscall/types_freebsd.go
+++ b/src/pkg/syscall/types_freebsd.go
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build ignore
+
 /*
 Input to cgo -godefs.  See also mkerrors.sh and mkall.sh
 */
 
-// +build ignore
-
 // +godefs map struct_in_addr [4]byte /* in_addr */
 // +godefs map struct_in6_addr [16]byte /* in6_addr */
 
diff --git a/src/pkg/syscall/types_linux.go b/src/pkg/syscall/types_linux.go
index 395162f128..0030960b5c 100644
--- a/src/pkg/syscall/types_linux.go
+++ b/src/pkg/syscall/types_linux.go
@@ -2,10 +2,12 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Input to cgo -godefs.  See also mkerrors.sh and mkall.sh
-
 // +build ignore
 
+/*
+Input to cgo -godefs.  See also mkerrors.sh and mkall.sh
+*/
+
 // +godefs map struct_in_addr [4]byte /* in_addr */
 // +godefs map struct_in6_addr [16]byte /* in6_addr */
 
diff --git a/src/pkg/syscall/types_netbsd.go b/src/pkg/syscall/types_netbsd.go
index 6f7ef3529f..518688833b 100644
--- a/src/pkg/syscall/types_netbsd.go
+++ b/src/pkg/syscall/types_netbsd.go
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build ignore
+
 /*
 Input to cgo -godefs.  See also mkerrors.sh and mkall.sh
 */
 
-// +build ignore
-
 // +godefs map struct_in_addr [4]byte /* in_addr */
 // +godefs map struct_in6_addr [16]byte /* in6_addr */
 
diff --git a/src/pkg/syscall/types_openbsd.go b/src/pkg/syscall/types_openbsd.go
index 6f7ef3529f..518688833b 100644
--- a/src/pkg/syscall/types_openbsd.go
+++ b/src/pkg/syscall/types_openbsd.go
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build ignore
+
 /*
 Input to cgo -godefs.  See also mkerrors.sh and mkall.sh
 */
 
-// +build ignore
-
 // +godefs map struct_in_addr [4]byte /* in_addr */
 // +godefs map struct_in6_addr [16]byte /* in6_addr */