diff --git a/include/mcl/fp.hpp b/include/mcl/fp.hpp
index 4234fc5..88515d4 100644
--- a/include/mcl/fp.hpp
+++ b/include/mcl/fp.hpp
@@ -339,7 +339,6 @@ public:
 		cybozu::write(pb, os, buf + sizeof(buf) - len, len);
 	}
 	/*
-		mode = Mod : set x mod p if sizeof(S) * n <= 64 else error
 		set array x as little endian
 	*/
 	template<class S>
@@ -351,15 +350,11 @@ public:
 	template<class S>
 	void setArray(bool *pb, const S *x, size_t n)
 	{
-		setArray_(pb, x, n, fp::NoMask);
-	}
-	/*
-		mask x with (1 << bitLen) and subtract p if x >= p
-	*/
-	template<class S>
-	void setArrayMaskMod(const S *x, size_t n)
-	{
-		fp::copyAndMask(v_, x, sizeof(S) * n, op_, fp::MaskAndMod);
+		if (!fp::convertArrayAsLE(v_, op_.N, x, n) || fp::isGreaterOrEqualArray(v_, op_.p, op_.N)) {
+			*pb = false;
+			return;
+		}
+		*pb = true;
 		toMont();
 	}
 	/*
diff --git a/src/fp.cpp b/src/fp.cpp
index 7f2cfef..caad342 100644
--- a/src/fp.cpp
+++ b/src/fp.cpp
@@ -665,20 +665,6 @@ int detectIoMode(int ioMode, const std::ios_base& ios)
 bool copyAndMask(Unit *y, const void *x, size_t xByteSize, const Op& op, MaskMode maskMode)
 {
 	const size_t fpByteSize = sizeof(Unit) * op.N;
-	if (maskMode == Mod) {
-		if (xByteSize > fpByteSize * 2) return false;
-		mpz_class mx;
-		bool b;
-		gmp::setArray(&b, mx, (const uint8_t*)x, xByteSize);
-		if (!b) return false;
-#ifdef MCL_USE_VINT
-		op.modp.modp(mx, mx);
-#else
-		mx %= op.mp;
-#endif
-		mcl::fp::convertArrayAsLE(y, op.N, gmp::getUnit(mx), gmp::getUnitSize(mx));
-		return true;
-	}
 	if (xByteSize > fpByteSize) {
 		if (maskMode == NoMask) return false;
 		xByteSize = fpByteSize;
diff --git a/test/fp_test.cpp b/test/fp_test.cpp
index 9a8ee29..c863a66 100644
--- a/test/fp_test.cpp
+++ b/test/fp_test.cpp
@@ -512,11 +512,11 @@ void anotherFpTest(mcl::fp::Mode mode)
 
 void setArrayTest1()
 {
-	char b1[] = { 0x56, 0x34, 0x12 };
+	uint8_t b1[] = { 0x56, 0x34, 0x12 };
 	Fp x;
 	x.setArray(b1, 3);
 	CYBOZU_TEST_EQUAL(x, 0x123456);
-	int b2[] = { 0x12, 0x34 };
+	uint32_t b2[] = { 0x12, 0x34 };
 	x.setArray(b2, 2);
 	CYBOZU_TEST_EQUAL(x, Fp("0x3400000012"));
 }