diff --git a/libdevcore/CommonJS.cpp b/libdevcore/CommonJS.cpp
index f173e779e..262944b65 100644
--- a/libdevcore/CommonJS.cpp
+++ b/libdevcore/CommonJS.cpp
@@ -23,15 +23,17 @@
 
 #include "CommonJS.h"
 
+using namespace std;
+
 namespace dev
 {
 
-bytes jsToBytes(std::string const& _s)
+bytes jsToBytes(string const& _s)
 {
 	if (_s.substr(0, 2) == "0x")
 		// Hex
 		return fromHex(_s.substr(2));
-	else if (_s.find_first_not_of("0123456789") == std::string::npos)
+	else if (_s.find_first_not_of("0123456789") == string::npos)
 		// Decimal
 		return toCompactBigEndian(bigint(_s));
 	else
@@ -42,7 +44,7 @@ bytes padded(bytes _b, unsigned _l)
 {
 	while (_b.size() < _l)
 		_b.insert(_b.begin(), 0);
-	return asBytes(asString(_b).substr(_b.size() - std::max(_l, _l)));
+	return asBytes(asString(_b).substr(_b.size() - max(_l, _l)));
 }
 
 bytes paddedRight(bytes _b, unsigned _l)
@@ -54,7 +56,7 @@ bytes paddedRight(bytes _b, unsigned _l)
 bytes unpadded(bytes _b)
 {
 	auto p = asString(_b).find_last_not_of((char)0);
-	_b.resize(p == std::string::npos ? 0 : (p + 1));
+	_b.resize(p == string::npos ? 0 : (p + 1));
 	return _b;
 }
 
@@ -72,18 +74,18 @@ bytes unpadLeft(bytes _b)
 	return _b;
 }
 
-std::string fromRaw(h256 _n, unsigned* _inc)
+string fromRaw(h256 _n, unsigned* _inc)
 {
 	if (_n)
 	{
-		std::string s((char const*)_n.data(), 32);
+		string s((char const*)_n.data(), 32);
 		auto l = s.find_first_of('\0');
 		if (!l)
 			return "";
-		if (l != std::string::npos)
+		if (l != string::npos)
 		{
 			auto p = s.find_first_not_of('\0', l);
-			if (!(p == std::string::npos || (_inc && p == 31)))
+			if (!(p == string::npos || (_inc && p == 31)))
 				return "";
 			if (_inc)
 				*_inc = (byte)s[31];
diff --git a/libdevcore/CommonJS.h b/libdevcore/CommonJS.h
index 38159da25..567572afd 100644
--- a/libdevcore/CommonJS.h
+++ b/libdevcore/CommonJS.h
@@ -38,12 +38,12 @@ template <unsigned S> std::string toJS(FixedHash<S> const& _h)
 
 template <unsigned N> std::string toJS(boost::multiprecision::number<boost::multiprecision::cpp_int_backend<N, N, boost::multiprecision::unsigned_magnitude, boost::multiprecision::unchecked, void>> const& _n)
 {
-	return "0x" + toHex(toCompactBigEndian(_n));
+	return "0x" + toHex(toCompactBigEndian(_n, 1));
 }
 
-inline std::string toJS(dev::bytes const& _n)
+inline std::string toJS(bytes const& _n)
 {
-	return "0x" + dev::toHex(_n);
+	return "0x" + toHex(_n);
 }
 
 template< typename T >std::string toJS( T const& i )
@@ -81,7 +81,7 @@ template <unsigned N> FixedHash<N> jsToFixed(std::string const& _s)
 
 inline std::string jsToFixed(double _s)
 {
-	return toJS(dev::u256(_s * (double)(dev::u256(1) << 128)));
+	return toJS(u256(_s * (double)(u256(1) << 128)));
 }
 
 template <unsigned N> boost::multiprecision::number<boost::multiprecision::cpp_int_backend<N * 8, N * 8, boost::multiprecision::unsigned_magnitude, boost::multiprecision::unchecked, void>> jsToInt(std::string const& _s)
@@ -106,13 +106,13 @@ inline int jsToInt(std::string const& _s)
 
 inline std::string jsToDecimal(std::string const& _s)
 {
-	return dev::toString(jsToU256(_s));
+	return toString(jsToU256(_s));
 }
 
-inline std::string jsFromBinary(dev::bytes _s, unsigned _padding = 32)
+inline std::string jsFromBinary(bytes _s, unsigned _padding = 32)
 {
 	_s.resize(std::max<unsigned>(_s.size(), _padding));
-	return "0x" + dev::toHex(_s);
+	return "0x" + toHex(_s);
 }
 
 inline std::string jsFromBinary(std::string const& _s, unsigned _padding = 32)
@@ -122,7 +122,7 @@ inline std::string jsFromBinary(std::string const& _s, unsigned _padding = 32)
 
 inline double jsFromFixed(std::string const& _s)
 {
-	return (double)jsToU256(_s) / (double)(dev::u256(1) << 128);
+	return (double)jsToU256(_s) / (double)(u256(1) << 128);
 }
 
 }