diff --git a/libevm/FeeStructure.cpp b/libevm/FeeStructure.cpp
index b9974a3e7..d29b9fef9 100644
--- a/libevm/FeeStructure.cpp
+++ b/libevm/FeeStructure.cpp
@@ -16,8 +16,22 @@
 */
 /** @file FeeStructure.cpp
  * @author Gav Wood <i@gavwood.com>
- * @author Pawel Bylica <chfast@gmail.com>
  * @date 2014
  */
 
 #include "FeeStructure.h"
+
+using namespace std;
+using namespace dev;
+using namespace dev::eth;
+
+u256 const dev::eth::c_stepGas = 1;
+u256 const dev::eth::c_balanceGas = 20;
+u256 const dev::eth::c_sha3Gas = 20;
+u256 const dev::eth::c_sloadGas = 20;
+u256 const dev::eth::c_sstoreGas = 100;
+u256 const dev::eth::c_createGas = 100;
+u256 const dev::eth::c_callGas = 20;
+u256 const dev::eth::c_memoryGas = 1;
+u256 const dev::eth::c_txDataGas = 5;
+u256 const dev::eth::c_txGas = 500;
diff --git a/libevm/FeeStructure.h b/libevm/FeeStructure.h
index 6fa30dea4..76be9a398 100644
--- a/libevm/FeeStructure.h
+++ b/libevm/FeeStructure.h
@@ -16,29 +16,28 @@
 */
 /** @file FeeStructure.h
  * @author Gav Wood <i@gavwood.com>
- * @author Pawel Bylica <chfast@gmail.com>
  * @date 2014
  */
 
 #pragma once
 
-#include <cstdint>
+#include <libdevcore/Common.h>
 
 namespace dev
 {
 namespace eth
 {
 
-static uint32_t const c_stepGas		= 1;	///< Once per operation, except for SSTORE, SLOAD, BALANCE, SHA3, CREATE, CALL.
-static uint32_t const c_balanceGas	= 20;	///< Once per BALANCE operation.
-static uint32_t const c_sha3Gas		= 20;	///< Once per SHA3 operation.
-static uint32_t const c_sloadGas	= 20;	///< Once per SLOAD operation.
-static uint32_t const c_sstoreGas	= 100;	///< Once per non-zero storage element in a CREATE call/transaction. Also, once/twice per SSTORE operation depending on whether the zeroness changes (twice iff it changes from zero; nothing at all if to zero) or doesn't (once).
-static uint32_t const c_createGas	= 100;	///< Once per CREATE operation & contract-creation transaction.
-static uint32_t const c_callGas		= 20;	///< Once per CALL operation & message call transaction.
-static uint32_t const c_memoryGas	= 1;	///< Times the address of the (highest referenced byte in memory + 1). NOTE: referencing happens on read, write and in instructions such as RETURN and CALL.
-static uint32_t const c_txDataGas	= 5;	///< Per byte of data attached to a transaction. NOTE: Not payable on data of calls between transactions.
-static uint32_t const c_txGas		= 500;	///< Per transaction. NOTE: Not payable on data of calls between transactions.
+extern u256 const c_stepGas;			///< Once per operation, except for SSTORE, SLOAD, BALANCE, SHA3, CREATE, CALL.
+extern u256 const c_balanceGas;			///< Once per BALANCE operation.
+extern u256 const c_sha3Gas;			///< Once per SHA3 operation.
+extern u256 const c_sloadGas;			///< Once per SLOAD operation.
+extern u256 const c_sstoreGas;			///< Once per non-zero storage element in a CREATE call/transaction. Also, once/twice per SSTORE operation depending on whether the zeroness changes (twice iff it changes from zero; nothing at all if to zero) or doesn't (once).
+extern u256 const c_createGas;			///< Once per CREATE operation & contract-creation transaction.
+extern u256 const c_callGas;			///< Once per CALL operation & message call transaction.
+extern u256 const c_memoryGas;			///< Times the address of the (highest referenced byte in memory + 1). NOTE: referencing happens on read, write and in instructions such as RETURN and CALL.
+extern u256 const c_txDataGas;			///< Per byte of data attached to a transaction. NOTE: Not payable on data of calls between transactions.
+extern u256 const c_txGas;				///< Per transaction. NOTE: Not payable on data of calls between transactions.
 
 }
 }