diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5f51c1e..30b398b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -136,23 +136,12 @@ set_target_properties(mcl_st PROPERTIES OUTPUT_NAME mcl)
 # https://community.kde.org/Policies/Binary_Compatibility_Issues_With_C%2B%2B#The_Do.27s_and_Don.27ts
 
 set(LIBS mcl ${EXT_LIBS})
-add_library(mclbn256 SHARED src/bn_c256.cpp)
-target_link_libraries(mclbn256 ${LIBS})
-add_library(mclbn384 SHARED src/bn_c384.cpp)
-target_link_libraries(mclbn384 ${LIBS})
-add_library(mclbn512 SHARED src/bn_c512.cpp)
-target_link_libraries(mclbn512 ${LIBS})
-add_library(mclbn384_256 SHARED src/bn_c384_256.cpp)
-target_link_libraries(mclbn384_256 ${LIBS})
-
-add_executable(bn_c256_test test/bn_c256_test.cpp)
-target_link_libraries(bn_c256_test mclbn256)
-add_executable(bn_c384_test test/bn_c384_test.cpp)
-target_link_libraries(bn_c384_test mclbn384)
-add_executable(bn_c512_test test/bn_c512_test.cpp)
-target_link_libraries(bn_c512_test mclbn512)
-add_executable(bn_c384_256_test test/bn_c384_256_test.cpp)
-target_link_libraries(bn_c384_256_test mclbn384_256)
+foreach(bit IN ITEMS 256 384 384_256 512)
+	add_library(mclbn${bit} SHARED src/bn_c${bit}.cpp)
+	target_link_libraries(mclbn${bit} ${LIBS})
+	add_executable(bn_c${bit}_test test/bn_c${bit}_test.cpp)
+	target_link_libraries(bn_c${bit}_test mclbn${bit})
+endforeach()
 
 file(GLOB MCL_HEADERS include/mcl/*.hpp include/mcl/bn.h include/mcl/curve_type.h)
 file(GLOB CYBOZULIB_HEADERS include/cybozu/*.hpp)