--- include/new
+++ include/new
@@ -39,13 +39,13 @@
 
 _UCXXEXPORT void* operator new(std::size_t numBytes) throw(std::bad_alloc);
 _UCXXEXPORT void operator delete(void* ptr) throw();
-#if __cpp_sized_deallocation
+#if defined(__cpp_sized_deallocation) && __cpp_sized_deallocation >= 201309
 _UCXXEXPORT void operator delete(void* ptr, std::size_t) throw();
 #endif
 
 _UCXXEXPORT void* operator new[](std::size_t numBytes) throw(std::bad_alloc);
 _UCXXEXPORT void operator delete[](void * ptr) throw();
-#if __cpp_sized_deallocation
+#if defined(__cpp_sized_deallocation) && __cpp_sized_deallocation >= 201309
 _UCXXEXPORT void operator delete[](void * ptr, std::size_t) throw();
 #endif