diff --git a/vm_payload/Android.bp b/vm_payload/Android.bp
index 967d1cf..7862702 100644
--- a/vm_payload/Android.bp
+++ b/vm_payload/Android.bp
@@ -10,6 +10,8 @@
     srcs: ["src/*.rs"],
     include_dirs: ["include"],
     prefer_rlib: true,
+    // Require unsafe blocks for inside unsafe functions.
+    flags: ["-Dunsafe_op_in_unsafe_fn"],
     rustlibs: [
         "android.system.virtualization.payload-rust",
         "libandroid_logger",