diff --git a/include/boost/type_traits/extent.hpp b/include/boost/type_traits/extent.hpp
index 6599236..88f98dd 100755
--- a/include/boost/type_traits/extent.hpp
+++ b/include/boost/type_traits/extent.hpp
@@ -71,7 +71,7 @@ struct extent_imp<T const volatile[R], 0>
    BOOST_STATIC_CONSTANT(std::size_t, value = R);
 };
 
-#if !BOOST_WORKAROUND(__BORLANDC__, < 0x600) && !defined(__IBMCPP__) &&  !BOOST_WORKAROUND(__DMC__, BOOST_TESTED_AT(0x840))
+#if !BOOST_WORKAROUND(__BORLANDC__, < 0x600) && !defined(__IBMCPP__) &&  !BOOST_WORKAROUND(__DMC__, BOOST_TESTED_AT(0x840)) && !defined(__MWERKS__)
 template <class T, std::size_t N>
 struct extent_imp<T[], N>
 {