diff --git a/rust/testing.go b/rust/testing.go
index 925b02c..80e4148 100644
--- a/rust/testing.go
+++ b/rust/testing.go
@@ -99,6 +99,7 @@
 func CreateTestContext() *android.TestContext {
 	ctx := android.NewTestArchContext()
 	android.RegisterPrebuiltMutators(ctx)
+	ctx.PreArchMutators(android.RegisterDefaultsPreArchMutators)
 	cc.RegisterRequiredBuildComponentsForTest(ctx)
 	ctx.RegisterModuleType("genrule", genrule.GenRuleFactory)
 	ctx.RegisterModuleType("rust_binary", RustBinaryFactory)