diff --git a/src/SerializedObject.cpp b/src/SerializedObject.cpp
index 4aea81b52b..f3700f5aef 100644
--- a/src/SerializedObject.cpp
+++ b/src/SerializedObject.cpp
@@ -939,7 +939,7 @@ std::auto_ptr<STObject> STObject::parseJson(const Json::Value& object, SField::r
 
 			case STI_UINT64:
 				if (value.isString())
-					data.push_back(new STUInt64(field, lexical_cast_st<uint64>(value.asString())));
+					data.push_back(new STUInt64(field, uintFromHex(value.asString())));
 				else if (value.isInt())
 					data.push_back(new STUInt64(field,
 						range_check_cast<uint64>(value.asInt(), 0, 18446744073709551615ull)));
diff --git a/src/utils.cpp b/src/utils.cpp
index 944a281139..979381c2c1 100644
--- a/src/utils.cpp
+++ b/src/utils.cpp
@@ -2,6 +2,7 @@
 #include "uint256.h"
 
 #include <boost/asio.hpp>
+#include <boost/foreach.hpp>
 #include <boost/regex.hpp>
 
 //
@@ -67,6 +68,16 @@ std::vector<unsigned char> strUnHex(const std::string& strSrc)
 	return strCopy(strTmp);
 }
 
+uint64_t uintFromHex(const std::string& strSrc)
+{
+	uint64_t	uValue = 0;
+
+	BOOST_FOREACH(char c, strSrc)
+		uValue = (uValue << 4) | charUnHex(c);
+
+	return uValue;
+}
+
 //
 // Misc string
 //
diff --git a/src/utils.h b/src/utils.h
index 5b4d184e73..5dd4208055 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -162,6 +162,8 @@ bool isZero(Iterator first, int iSize)
 int charUnHex(char cDigit);
 void strUnHex(std::string& strDst, const std::string& strSrc);
 
+uint64_t uintFromHex(const std::string& strSrc);
+
 std::vector<unsigned char> strUnHex(const std::string& strSrc);
 
 std::vector<unsigned char> strCopy(const std::string& strSrc);