diff --git a/android/arch.go b/android/arch.go
index c767bd7..5074c4c 100644
--- a/android/arch.go
+++ b/android/arch.go
@@ -25,10 +25,10 @@
 )
 
 func init() {
-	RegisterBottomUpMutator("defaults_deps", defaultsDepsMutator)
+	RegisterBottomUpMutator("defaults_deps", defaultsDepsMutator).Parallel()
 	RegisterTopDownMutator("defaults", defaultsMutator)
 
-	RegisterBottomUpMutator("arch", ArchMutator)
+	RegisterBottomUpMutator("arch", ArchMutator).Parallel()
 }
 
 var (