diff --git a/tests/aidl/Android.bp b/tests/aidl/Android.bp
index d59ca7e..ed4e8ff 100644
--- a/tests/aidl/Android.bp
+++ b/tests/aidl/Android.bp
@@ -6,6 +6,10 @@
     name: "com.android.microdroid.testservice",
     srcs: ["com/android/microdroid/testservice/**/*.aidl"],
     unstable: true,
+    flags: [
+        "-Werror",
+        "-Wno-mixed-oneway",
+    ],
     backend: {
         java: {
             gen_rpc: true,