diff --git a/java/java_test.go b/java/java_test.go
index 582ebe9..41f57f2 100644
--- a/java/java_test.go
+++ b/java/java_test.go
@@ -96,6 +96,8 @@
 	ctx.RegisterPreSingletonType("overlay", android.SingletonFactoryAdaptor(OverlaySingletonFactory))
 	ctx.RegisterPreSingletonType("sdk_versions", android.SingletonFactoryAdaptor(sdkPreSingletonFactory))
 
+	android.RegisterPrebuiltMutators(ctx)
+
 	// Register module types and mutators from cc needed for JNI testing
 	cc.RegisterRequiredBuildComponentsForTest(ctx)