diff --git a/include/boost/preprocessor/iterate.hpp b/include/boost/preprocessor/iterate.hpp
index 70d6522..d74bff5 100644
--- a/include/boost/preprocessor/iterate.hpp
+++ b/include/boost/preprocessor/iterate.hpp
@@ -67,4 +67,7 @@
 #
 # define BOOST_PP_INCLUDE_SELF() <boost/preprocessor/detail/iterate/self.hpp>
 #
+# define BOOST_PP_ASSIGN_SLOT(i) BOOST_PP_DETAIL_CAT4(<boost/preprocessor/detail/iterate/slot, i, ., hpp>)
+# define BOOST_PP_SLOT(i) BOOST_PP_DETAIL_CAT2(BOOST_PP_SLOT_, i)
+#
 # endif