diff --git a/include/mcl/ec.hpp b/include/mcl/ec.hpp
index 0b3c369..2c5ff85 100644
--- a/include/mcl/ec.hpp
+++ b/include/mcl/ec.hpp
@@ -445,18 +445,6 @@ public:
 	{
 		compressedExpression_ = compressedExpression;
 	}
-	/*
-		append to bv(not clear bv)
-	*/
-	static inline size_t getBitVecSize()
-	{
-		const size_t bitLen = _Fp::getModBitLen();
-		if (compressedExpression_) {
-			return bitLen + 2;
-		} else {
-			return bitLen * 2 + 1;;
-		}
-	}
 	static inline void getYfromX(Fp& y, const Fp& x, bool isYodd)
 	{
 		Fp t;
diff --git a/include/mcl/fp.hpp b/include/mcl/fp.hpp
index b304179..54807e0 100644
--- a/include/mcl/fp.hpp
+++ b/include/mcl/fp.hpp
@@ -297,7 +297,6 @@ public:
 		return fp::compareArray(v_, op_.p, op_.N) < 0;
 	}
 	static inline size_t getModBitLen() { return op_.bitLen; }
-	static inline size_t getBitVecSize() { return op_.bitLen; }
 	bool operator==(const FpT& rhs) const { return fp::isEqualArray(v_, rhs.v_, op_.N); }
 	bool operator!=(const FpT& rhs) const { return !operator==(rhs); }
 	inline friend FpT operator+(const FpT& x, const FpT& y) { FpT z; add(z, x, y); return z; }