diff --git a/imports/fastwalk_dirent_ino.go b/imports/fastwalk_dirent_ino.go
index ee85bc4d..9fc6de03 100644
--- a/imports/fastwalk_dirent_ino.go
+++ b/imports/fastwalk_dirent_ino.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build linux,!appengine darwin
+// +build linux darwin
+// +build !appengine
 
 package imports
 
diff --git a/imports/fastwalk_unix.go b/imports/fastwalk_unix.go
index 5854233d..db6ee8da 100644
--- a/imports/fastwalk_unix.go
+++ b/imports/fastwalk_unix.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build linux,!appengine darwin freebsd openbsd netbsd
+// +build linux darwin freebsd openbsd netbsd
+// +build !appengine
 
 package imports