diff --git a/include/boost/preprocessor/detail/cat.hpp b/include/boost/preprocessor/detail/cat.hpp
index 8ccad4e..78a3b65 100644
--- a/include/boost/preprocessor/detail/cat.hpp
+++ b/include/boost/preprocessor/detail/cat.hpp
@@ -2,24 +2,29 @@
 #define BOOST_PREPROCESSOR_DETAIL_CAT_HPP
 
 /* Copyright (C) 2002 Vesa Karvonen
- *
- * Permission to copy, use, modify, sell and distribute this software is
- * granted provided this copyright notice appears in all copies. This
- * software is provided "as is" without express or implied warranty, and
- * with no claim as to its suitability for any purpose.
- *
- * See http://www.boost.org for most recent version.
- */
+*
+* Permission to copy, use, modify, sell and distribute this software is
+* granted provided this copyright notice appears in all copies. This
+* software is provided "as is" without express or implied warranty, and
+* with no claim as to its suitability for any purpose.
+*
+* See http://www.boost.org for most recent version.
+*/
 
-#define BOOST_PP_DETAIL_CAT2(A,B) BOOST_PP_DETAIL_DO_CAT2(A,B)
+#define BOOST_PP_DETAIL_CAT2(A,B) BOOST_PP_DETAIL_CAT2_DELAY(A,B)
+#define BOOST_PP_DETAIL_CAT2_DELAY(A, B) BOOST_PP_DETAIL_DO_CAT2(A, B)
 #define BOOST_PP_DETAIL_DO_CAT2(A,B) A##B
 
-#define BOOST_PP_DETAIL_CAT3(A,B,C) BOOST_PP_DETAIL_DO_CAT3(A,B,C)
+#define BOOST_PP_DETAIL_CAT3(A,B,C) BOOST_PP_DETAIL_CAT3_DELAY(A,B,C)
+#define BOOST_PP_DETAIL_CAT3_DELAY(A,B,C) BOOST_PP_DETAIL_DO_CAT3(A,B,C)
 #define BOOST_PP_DETAIL_DO_CAT3(A,B,C) A##B##C
 
-#define BOOST_PP_DETAIL_CAT4(A,B,C,D) BOOST_PP_DETAIL_DO_CAT4(A,B,C,D)
+#define BOOST_PP_DETAIL_CAT4(A,B,C,D) BOOST_PP_DETAIL_CAT4_DELAY(A,B,C,D)
+#define BOOST_PP_DETAIL_CAT4_DELAY(A,B,C,D) BOOST_PP_DETAIL_DO_CAT4(A,B,C,D)
 #define BOOST_PP_DETAIL_DO_CAT4(A,B,C,D) A##B##C##D
 
-#define BOOST_PP_DETAIL_CAT5(A,B,C,D,E) BOOST_PP_DETAIL_DO_CAT5(A,B,C,D,E)
+#define BOOST_PP_DETAIL_CAT5(A,B,C,D,E) BOOST_PP_DETAIL_CAT5_DELAY(A,B,C,D,E)
+#define BOOST_PP_DETAIL_CAT5_DELAY(A,B,C,D,E) BOOST_PP_DETAIL_DO_CAT5(A,B,C,D,E)
 #define BOOST_PP_DETAIL_DO_CAT5(A,B,C,D,E) A##B##C##D##E
+
 #endif