diff --git a/include/ostream b/include/ostream
index f3250a708..197636eac 100644
--- a/include/ostream
+++ b/include/ostream
@@ -1071,19 +1071,17 @@ operator<<(basic_ostream<_CharT, _Traits>& __os, shared_ptr<_Yp> const& __p)
     return __os << __p.get();
 }
 
-#ifndef _LIBCPP_HAS_NO_DECLTYPE
 template<class _CharT, class _Traits, class _Yp, class _Dp>
 inline _LIBCPP_INLINE_VISIBILITY
 typename enable_if
 <
-    is_same<void, typename __void_t<decltype(declval<basic_ostream<_CharT, _Traits>&>() << declval<_Yp>())>::type>::value,
+    is_same<void, typename __void_t<decltype((declval<basic_ostream<_CharT, _Traits>&>() << declval<typename unique_ptr<_Yp, _Dp>::pointer>()))>::type>::value,
     basic_ostream<_CharT, _Traits>&
 >::type
 operator<<(basic_ostream<_CharT, _Traits>& __os, unique_ptr<_Yp, _Dp> const& __p)
 {
     return __os << __p.get();
 }
-#endif
 
 template <class _CharT, class _Traits, size_t _Size>
 basic_ostream<_CharT, _Traits>&
diff --git a/test/std/utilities/memory/unique.ptr/unique.ptr.special/io.fail.cpp b/test/std/utilities/memory/unique.ptr/unique.ptr.special/io.fail.cpp
index 48c90f7b9..54c85e943 100644
--- a/test/std/utilities/memory/unique.ptr/unique.ptr.special/io.fail.cpp
+++ b/test/std/utilities/memory/unique.ptr/unique.ptr.special/io.fail.cpp
@@ -24,11 +24,12 @@
 #include <sstream>
 #include <cassert>
 
-class A {};
+#include "min_allocator.h"
+#include "deleter_types.h"
 
 int main()
 {
-    std::unique_ptr<A> p(new A);
+    std::unique_ptr<int, PointerDeleter<int>> p;
     std::ostringstream os;
-    os << p;
+    os << p; // expected-error {{invalid operands to binary expression}}
 }