diff --git a/include/boost/function/function_template.hpp b/include/boost/function/function_template.hpp
index 9f76425..d6799a1 100644
--- a/include/boost/function/function_template.hpp
+++ b/include/boost/function/function_template.hpp
@@ -22,7 +22,7 @@
 #define BOOST_FUNCTION_ARGS BOOST_PP_ENUM_PARAMS(BOOST_FUNCTION_NUM_ARGS, a)
 
 #define BOOST_FUNCTION_ARG_TYPE(J,I,D) \
-  typedef BOOST_PP_CAT(T,I) BOOST_PP_CAT(arg, BOOST_PP_CAT(BOOST_PP_INC(I),_type));
+  typedef BOOST_PP_CAT(T,I) BOOST_PP_CAT(BOOST_PP_CAT(arg, BOOST_PP_INC(I)),_type);
 
 #define BOOST_FUNCTION_ARG_TYPES BOOST_PP_REPEAT(BOOST_FUNCTION_NUM_ARGS,BOOST_FUNCTION_ARG_TYPE,BOOST_PP_EMPTY)