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 (
diff --git a/android/mutator.go b/android/mutator.go
index 9405f2d..c0cb3aa 100644
--- a/android/mutator.go
+++ b/android/mutator.go
@@ -44,8 +44,8 @@
 	androidBaseContextImpl
 }
 
-func RegisterBottomUpMutator(name string, mutator AndroidBottomUpMutator) {
-	soong.RegisterBottomUpMutator(name, func(ctx blueprint.BottomUpMutatorContext) {
+func RegisterBottomUpMutator(name string, mutator AndroidBottomUpMutator) soong.BottomUpMutatorHandle {
+	return soong.RegisterBottomUpMutator(name, func(ctx blueprint.BottomUpMutatorContext) {
 		if a, ok := ctx.Module().(Module); ok {
 			actx := &androidBottomUpMutatorContext{
 				BottomUpMutatorContext: ctx,
diff --git a/android/variable.go b/android/variable.go
index d2dc5b9..531125d 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -24,7 +24,7 @@
 )
 
 func init() {
-	RegisterBottomUpMutator("variable", variableMutator)
+	RegisterBottomUpMutator("variable", variableMutator).Parallel()
 }
 
 type variableProperties struct {