diff --git a/include/boost/container/experimental/segmented_iterator_traits.hpp b/include/boost/container/experimental/segmented_iterator_traits.hpp
index 97ffc47..e5ab19e 100644
--- a/include/boost/container/experimental/segmented_iterator_traits.hpp
+++ b/include/boost/container/experimental/segmented_iterator_traits.hpp
@@ -374,6 +374,7 @@ struct deepest_local_iterator
    #define BOOST_CONTAINER_SEGMENTED_AUTO_UNROLL BOOST_CONTAINER_AUTO_UNROLL
 #elif defined(BOOST_CONTAINER_SEGMENTED_DISABLE_PRAGMA_UNROLL)
    #define BOOST_CONTAINER_SEGMENTED_UNROLL(N)
+   #define BOOST_CONTAINER_SEGMENTED_AUTO_UNROLL
 #else
 #error "Must define either BOOST_CONTAINER_SEGMENTED_ENABLE_PRAGMA_UNROLL or BOOST_CONTAINER_SEGMENTED_DISABLE_PRAGMA_UNROLL"
 #endif