diff --git a/test/objects/cxx11_allocator.hpp b/test/objects/cxx11_allocator.hpp
index 4ca0cc62..62491824 100644
--- a/test/objects/cxx11_allocator.hpp
+++ b/test/objects/cxx11_allocator.hpp
@@ -182,9 +182,7 @@ namespace test
 
     ~cxx11_allocator_base() { detail::tracker.allocator_unref(); }
 
-#if !defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS)
     cxx11_allocator_base& operator=(cxx11_allocator_base const& x) = default;
-#endif
 
     pointer address(reference r) { return pointer(&r); }
 
@@ -263,9 +261,7 @@ namespace test
 
     cxx11_allocator(cxx11_allocator const& x) : cxx11_allocator_base<T>(x) {}
 
-#if !defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS)
     cxx11_allocator& operator=(cxx11_allocator const& x) = default;
-#endif 
 
     // When not propagating swap, allocators are always equal
     // to avoid undefined behaviour.
@@ -310,9 +306,7 @@ namespace test
 
     cxx11_allocator(cxx11_allocator const& x) : cxx11_allocator_base<T>(x) {}
 
-#if !defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS)
     cxx11_allocator& operator=(cxx11_allocator const& x) = default;
-#endif
 
     // When not propagating swap, allocators are always equal
     // to avoid undefined behaviour.