diff --git a/include/boost/smart_ptr/detail/deprecated_macros.hpp b/include/boost/smart_ptr/detail/deprecated_macros.hpp
index 4e4ba60..f39d2ac 100644
--- a/include/boost/smart_ptr/detail/deprecated_macros.hpp
+++ b/include/boost/smart_ptr/detail/deprecated_macros.hpp
@@ -15,7 +15,7 @@ BOOST_PRAGMA_MESSAGE("The macro BOOST_SP_ENABLE_DEBUG_HOOKS has been deprecated
 
 #if defined(BOOST_SP_USE_STD_ALLOCATOR)
 
-BOOST_PRAGMA_MESSAGE("The macro BOOST_SP_USE_STD_ALLOCATOR has been deprecated in 1.87 and support for it will be removed.")
+BOOST_PRAGMA_MESSAGE("The macro BOOST_SP_USE_STD_ALLOCATOR has been deprecated in 1.87 and support for it was removed in 1.90.")
 
 #endif
 
diff --git a/include/boost/smart_ptr/detail/sp_counted_impl.hpp b/include/boost/smart_ptr/detail/sp_counted_impl.hpp
index a3f83c7..6fdf9c3 100644
--- a/include/boost/smart_ptr/detail/sp_counted_impl.hpp
+++ b/include/boost/smart_ptr/detail/sp_counted_impl.hpp
@@ -18,10 +18,6 @@
 // http://www.boost.org/LICENSE_1_0.txt)
 //
 
-#if defined(BOOST_SP_USE_STD_ALLOCATOR) && defined(BOOST_SP_USE_QUICK_ALLOCATOR)
-# error BOOST_SP_USE_STD_ALLOCATOR and BOOST_SP_USE_QUICK_ALLOCATOR are incompatible.
-#endif
-
 #include <boost/smart_ptr/detail/sp_counted_base.hpp>
 #include <boost/smart_ptr/detail/deprecated_macros.hpp>
 #include <boost/core/checked_delete.hpp>
@@ -91,20 +87,6 @@ public:
         return 0;
     }
 
-#if defined(BOOST_SP_USE_STD_ALLOCATOR)
-
-    void * operator new( std::size_t )
-    {
-        return std::allocator<this_type>().allocate( 1, static_cast<this_type *>(0) );
-    }
-
-    void operator delete( void * p )
-    {
-        std::allocator<this_type>().deallocate( static_cast<this_type *>(p), 1 );
-    }
-
-#endif
-
 #if defined(BOOST_SP_USE_QUICK_ALLOCATOR)
 
     void * operator new( std::size_t )
@@ -164,20 +146,6 @@ public:
         return &reinterpret_cast<char&>( del );
     }
 
-#if defined(BOOST_SP_USE_STD_ALLOCATOR)
-
-    void * operator new( std::size_t )
-    {
-        return std::allocator<this_type>().allocate( 1, static_cast<this_type *>(0) );
-    }
-
-    void operator delete( void * p )
-    {
-        std::allocator<this_type>().deallocate( static_cast<this_type *>(p), 1 );
-    }
-
-#endif
-
 #if defined(BOOST_SP_USE_QUICK_ALLOCATOR)
 
     void * operator new( std::size_t )
diff --git a/test/shared_ptr_alloc_test.cpp b/test/shared_ptr_alloc_test.cpp
index 9b1ebde..a0ec41e 100644
--- a/test/shared_ptr_alloc_test.cpp
+++ b/test/shared_ptr_alloc_test.cpp
@@ -122,12 +122,6 @@ int main()
     std::cout << "BOOST_HAS_THREADS: (not defined)\n";
 #endif
 
-#if defined(BOOST_SP_USE_STD_ALLOCATOR)
-    std::cout << "BOOST_SP_USE_STD_ALLOCATOR: (defined)\n";
-#else
-    std::cout << "BOOST_SP_USE_STD_ALLOCATOR: (not defined)\n";
-#endif
-
 #if defined(BOOST_SP_USE_QUICK_ALLOCATOR)
     std::cout << "BOOST_SP_USE_QUICK_ALLOCATOR: (defined)\n";
 #else