diff --git a/include/mcl/bls12_381.hpp b/include/mcl/bls12_381.hpp
new file mode 100644
index 0000000..316e142
--- /dev/null
+++ b/include/mcl/bls12_381.hpp
@@ -0,0 +1,15 @@
+#pragma once
+/**
+	@file
+	@brief preset class for BLS12-381 pairing
+	@author MITSUNARI Shigeo(@herumi)
+	@license modified new BSD license
+	http://opensource.org/licenses/BSD-3-Clause
+*/
+#define MCL_MAX_FP_BIT_SIZE 384
+#define MCL_MAX_FR_BIT_SIZE 256
+#include <mcl/bn.hpp>
+
+namespace mcl { namespace bls12 {
+using namespace mcl::bn;
+} }
diff --git a/test/bls12_test.cpp b/test/bls12_test.cpp
index 0aa06ae..2c4d98c 100644
--- a/test/bls12_test.cpp
+++ b/test/bls12_test.cpp
@@ -3,7 +3,7 @@
 #include <cybozu/benchmark.hpp>
 cybozu::CpuClock clk;
 #include <cybozu/test.hpp>
-#include <mcl/bn384.hpp>
+#include <mcl/bls12_381.hpp>
 #include <cybozu/option.hpp>
 #include <cybozu/xorshift.hpp>
 
@@ -11,7 +11,7 @@ cybozu::CpuClock clk;
 	#define MCL_AVOID_EXCEPTION_TEST
 #endif
 
-using namespace mcl::bn384;
+using namespace mcl::bls12;
 
 mcl::fp::Mode g_mode;
 
@@ -65,6 +65,7 @@ const struct TestSet {
 CYBOZU_TEST_AUTO(size)
 {
 	CYBOZU_TEST_EQUAL(sizeof(Fp), 48u);
+	CYBOZU_TEST_EQUAL(sizeof(Fr), 32u);
 	CYBOZU_TEST_EQUAL(sizeof(Fp2), sizeof(Fp) * 2);
 	CYBOZU_TEST_EQUAL(sizeof(Fp6), sizeof(Fp) * 6);
 	CYBOZU_TEST_EQUAL(sizeof(Fp12), sizeof(Fp) * 12);