diff --git a/google/appengine.go b/google/appengine.go
index 31e89f5..941cbb3 100644
--- a/google/appengine.go
+++ b/google/appengine.go
@@ -3,6 +3,7 @@
 // license that can be found in the LICENSE file.
 
 // +build appengine
+// +build !appenginevm
 
 package google
 
diff --git a/google/appenginevm.go b/google/appenginevm.go
index d9d27ce..2682af8 100644
--- a/google/appenginevm.go
+++ b/google/appenginevm.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 !appengine
+// +build appenginevm
 
 package google