diff --git a/include/boost/phoenix/core/limits.hpp b/include/boost/phoenix/core/limits.hpp
index 7ecacb1..5571ec6 100644
--- a/include/boost/phoenix/core/limits.hpp
+++ b/include/boost/phoenix/core/limits.hpp
@@ -27,7 +27,9 @@
 #define BOOST_PHOENIX_LIMIT BOOST_PROTO_MAX_ARITY
 #endif
 
-//#define PHOENIX_LIMIT BOOST_PHOENIX_LIMIT
+#if !defined(PHOENIX_LIMIT)
+#define PHOENIX_LIMIT BOOST_PHOENIX_LIMIT
+#endif
 
 #define BOOST_PHOENIX_LIMIT_STR BOOST_PP_STRINGIZE(BOOST_PHOENIX_PP_ROUND_UP(BOOST_PHOENIX_LIMIT))