diff --git a/LICENSE_1_0.txt b/LICENSE_1_0.txt
new file mode 100644
index 000000000..36b7cd93c
--- /dev/null
+++ b/LICENSE_1_0.txt
@@ -0,0 +1,23 @@
+Boost Software License - Version 1.0 - August 17th, 2003
+
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/include/boost/preprocessor/slot/detail/def.hpp b/include/boost/preprocessor/slot/detail/def.hpp
index 885099e55..dd83a8946 100644
--- a/include/boost/preprocessor/slot/detail/def.hpp
+++ b/include/boost/preprocessor/slot/detail/def.hpp
@@ -15,14 +15,14 @@
 # /* BOOST_PP_SLOT_OFFSET_x */
 #
 # define BOOST_PP_SLOT_OFFSET_10(x) (x) % 1000000000UL
-# define BOOST_PP_SLOT_OFFSET_9(x) BOOST_PP_SLOT_OFFSET_10(x) % 100000000UL
-# define BOOST_PP_SLOT_OFFSET_8(x) BOOST_PP_SLOT_OFFSET_9(x) % 10000000UL
-# define BOOST_PP_SLOT_OFFSET_7(x) BOOST_PP_SLOT_OFFSET_8(x) % 1000000UL
-# define BOOST_PP_SLOT_OFFSET_6(x) BOOST_PP_SLOT_OFFSET_7(x) % 100000UL
-# define BOOST_PP_SLOT_OFFSET_5(x) BOOST_PP_SLOT_OFFSET_6(x) % 10000UL
-# define BOOST_PP_SLOT_OFFSET_4(x) BOOST_PP_SLOT_OFFSET_5(x) % 1000UL
-# define BOOST_PP_SLOT_OFFSET_3(x) BOOST_PP_SLOT_OFFSET_4(x) % 100UL
-# define BOOST_PP_SLOT_OFFSET_2(x) BOOST_PP_SLOT_OFFSET_3(x) % 10UL
+# define BOOST_PP_SLOT_OFFSET_9(x) (x) % 100000000UL
+# define BOOST_PP_SLOT_OFFSET_8(x) (x) % 10000000UL
+# define BOOST_PP_SLOT_OFFSET_7(x) (x) % 1000000UL
+# define BOOST_PP_SLOT_OFFSET_6(x) (x) % 100000UL
+# define BOOST_PP_SLOT_OFFSET_5(x) (x) % 10000UL
+# define BOOST_PP_SLOT_OFFSET_4(x) (x) % 1000UL
+# define BOOST_PP_SLOT_OFFSET_3(x) (x) % 100UL
+# define BOOST_PP_SLOT_OFFSET_2(x) (x) % 10UL
 #
 # /* BOOST_PP_SLOT_CC_x */
 #