diff --git a/test/ctl/unique_ptr_test.cc b/test/ctl/unique_ptr_test.cc
index d786e3479..4d6699b25 100644
--- a/test/ctl/unique_ptr_test.cc
+++ b/test/ctl/unique_ptr_test.cc
@@ -54,13 +54,6 @@ struct SetsGDeleter
     }
 };
 
-struct FinalDeleter final
-{
-    void operator()(auto*) const noexcept
-    {
-    }
-};
-
 struct StatefulDeleter
 {
     char state;
@@ -69,8 +62,19 @@ struct StatefulDeleter
     }
 };
 
+struct FinalDeleter final
+{
+    void operator()(auto*) const noexcept
+    {
+    }
+};
+
 static_assert(sizeof(Ptr<int, SetsGDeleter>) == sizeof(int*));
 
+// not everyone uses [[no_unique_address]]...
+static_assert(!std::is_same_v<Ptr<int>, ctl::unique_ptr<int>> ||
+              sizeof(Ptr<int, FinalDeleter>) == sizeof(int*));
+
 struct SetsGCtor
 {
     SetsGCtor()