diff --git a/include/boost/preprocessor/arithmetic/detail/Is_1_number.hpp b/include/boost/preprocessor/arithmetic/detail/is_1_number.hpp
similarity index 100%
rename from include/boost/preprocessor/arithmetic/detail/Is_1_number.hpp
rename to include/boost/preprocessor/arithmetic/detail/is_1_number.hpp
diff --git a/include/boost/preprocessor/arithmetic/detail/Is_maximum_number.hpp b/include/boost/preprocessor/arithmetic/detail/is_maximum_number.hpp
similarity index 100%
rename from include/boost/preprocessor/arithmetic/detail/Is_maximum_number.hpp
rename to include/boost/preprocessor/arithmetic/detail/is_maximum_number.hpp
diff --git a/include/boost/preprocessor/arithmetic/detail/Is_minimum_number.hpp b/include/boost/preprocessor/arithmetic/detail/is_minimum_number.hpp
similarity index 100%
rename from include/boost/preprocessor/arithmetic/detail/Is_minimum_number.hpp
rename to include/boost/preprocessor/arithmetic/detail/is_minimum_number.hpp