diff --git a/test/bench.hpp b/test/bench.hpp
index 009bad1..494042b 100644
--- a/test/bench.hpp
+++ b/test/bench.hpp
@@ -1,3 +1,5 @@
+#include <mcl/lagrange.hpp>
+
 void testBench(const G1& P, const G2& Q)
 {
 	G1 Pa;
diff --git a/test/bn384_test.cpp b/test/bn384_test.cpp
index 8bb45b2..b5674a9 100644
--- a/test/bn384_test.cpp
+++ b/test/bn384_test.cpp
@@ -5,7 +5,6 @@
 #include <cybozu/xorshift.hpp>
 #include <mcl/bn384.hpp>
 #include <mcl/bn.hpp>
-#include <mcl/lagrange.hpp>
 
 using namespace mcl::bn384;
 
diff --git a/test/bn512_test.cpp b/test/bn512_test.cpp
index 8736377..905bfd3 100644
--- a/test/bn512_test.cpp
+++ b/test/bn512_test.cpp
@@ -5,7 +5,6 @@
 #include <cybozu/xorshift.hpp>
 #include <mcl/bn512.hpp>
 #include <mcl/bn.hpp>
-#include <mcl/lagrange.hpp>
 
 using namespace mcl::bn512;
 
diff --git a/test/bn_test.cpp b/test/bn_test.cpp
index 96ba6e1..929e235 100644
--- a/test/bn_test.cpp
+++ b/test/bn_test.cpp
@@ -6,7 +6,6 @@ cybozu::CpuClock clk;
 #include <mcl/bn256.hpp>
 #include <cybozu/option.hpp>
 #include <cybozu/xorshift.hpp>
-#include <mcl/lagrange.hpp>
 
 #if defined(__EMSCRIPTEN__) && !defined(MCL_AVOID_EXCEPTION_TEST)
 	#define MCL_AVOID_EXCEPTION_TEST