diff --git a/include/boost/preprocessor/detail/expand.hpp b/include/boost/preprocessor/detail/expand.hpp
index dde4af0..2fb8fff 100644
--- a/include/boost/preprocessor/detail/expand.hpp
+++ b/include/boost/preprocessor/detail/expand.hpp
@@ -11,5 +11,6 @@
  * See http://www.boost.org for most recent version.
  */
 
-#define BOOST_PP_DETAIL_EXPAND(X) X
+#define BOOST_PP_DETAIL_EXPAND(X) BOOST_PP_DETAIL_EXPAND_DELAY(X)
+#define BOOST_PP_DETAIL_EXPAND_DELAY(X) X
 #endif