diff --git a/unittests/ADT/polymorphic_ptr_test.cpp b/unittests/ADT/polymorphic_ptr_test.cpp
index 90c3385c4f2..ce001d1e309 100644
--- a/unittests/ADT/polymorphic_ptr_test.cpp
+++ b/unittests/ADT/polymorphic_ptr_test.cpp
@@ -57,6 +57,10 @@ TEST(polymorphic_ptr_test, Basic) {
   EXPECT_EQ(42, p->x);
 
   polymorphic_ptr<S> p2((llvm_move(p)));
+#if !LLVM_HAS_RVALUE_REFERENCES
+  // 'p' may not have been moved from in C++98, fake it for the test.
+  p2 = p.take();
+#endif
   EXPECT_FALSE((bool)p);
   EXPECT_TRUE(!p);
   EXPECT_TRUE((bool)p2);