diff --git a/include/boost/preprocessor/slot.hpp b/include/boost/preprocessor/slot.hpp
index 8e3482e..b8931f5 100644
--- a/include/boost/preprocessor/slot.hpp
+++ b/include/boost/preprocessor/slot.hpp
@@ -15,6 +15,7 @@
 # include <boost/preprocessor/detail/line.hpp>
 #
 # define BOOST_PP_SLOT_LIMIT 5
+# define BOOST_PP_SLOT_MAX 256
 #
 # define BOOST_PP_ASSIGN_SLOT(i) BOOST_PP_DETAIL_CAT2(BOOST_PP_ASSIGN_SLOT_, i)
 # define BOOST_PP_ASSIGN_SLOT_1 <boost/preprocessor/detail/slot/slot1.hpp>