diff -Naur a/brillo/dbus/dbus_signature.h b/brillo/dbus/dbus_signature.h
--- a/brillo/dbus/dbus_signature.h	2023-11-28 17:27:46.692301466 -0800
+++ b/brillo/dbus/dbus_signature.h	2023-11-28 17:28:17.244338858 -0800
@@ -55,7 +55,7 @@
 // holding the D-Bus signature.
 template <typename T, typename = void>
 struct DBusSignature {
-  static_assert(false, "Unsupported type for D-Bus");
+  static_assert(sizeof(T) == -1, "Unsupported type for D-Bus");
 };
 
 template <>