diff --git a/libevmjit/Compiler.cpp b/libevmjit/Compiler.cpp
index 5061dabb0..26d5c6f19 100644
--- a/libevmjit/Compiler.cpp
+++ b/libevmjit/Compiler.cpp
@@ -180,7 +180,7 @@ std::unique_ptr<llvm::Module> Compiler::compile(bytesConstRef bytecode)
 	RuntimeManager runtimeManager(m_builder);
 	GasMeter gasMeter(m_builder, runtimeManager);
 	Memory memory(m_builder, gasMeter, runtimeManager);
-	Ext ext(m_builder);
+	Ext ext(runtimeManager);
 	Stack stack(m_builder, runtimeManager);
 
 	m_builder.CreateBr(basicBlocks.begin()->second);
@@ -686,7 +686,7 @@ void Compiler::compileBasicBlock(BasicBlock& basicBlock, bytesConstRef bytecode,
 
 		case Instruction::ADDRESS:
 		{
-			auto value = ext.address();
+			auto value = _runtimeManager.get(RuntimeData::Address);
 			stack.push(value);
 			break;
 		}
@@ -873,7 +873,7 @@ void Compiler::compileBasicBlock(BasicBlock& basicBlock, bytesConstRef bytecode,
 
 			auto receiveAddress = codeAddress;
 			if (inst == Instruction::CALLCODE)
-				receiveAddress = ext.address();
+				receiveAddress = _runtimeManager.get(RuntimeData::Address);
 
 			auto ret = ext.call(gas, receiveAddress, value, inOff, inSize, outOff, outSize, codeAddress);
 			gasMeter.giveBack(gas);
diff --git a/libevmjit/Ext.cpp b/libevmjit/Ext.cpp
index 07023c674..2e38aef27 100644
--- a/libevmjit/Ext.cpp
+++ b/libevmjit/Ext.cpp
@@ -44,10 +44,10 @@ struct ExtData
 	const byte* code;
 };
 
-Ext::Ext(llvm::IRBuilder<>& _builder):
-	CompilerHelper(_builder)
+Ext::Ext(RuntimeManager& _runtimeManager):
+	RuntimeHelper(_runtimeManager)
 {
-	auto&& ctx = _builder.getContext();
+	auto&& ctx = m_builder.getContext();
 	auto module = getModule();
 
 	auto i256Ty = m_builder.getIntNTy(256);
@@ -126,7 +126,6 @@ Value* Ext::getDataElem(unsigned _index, const Twine& _name)
 	return m_builder.CreateLoad(valuePtr);
 }
 
-Value* Ext::address() { return getDataElem(0, "address"); }
 Value* Ext::caller() { return getDataElem(1, "caller"); }
 Value* Ext::origin() { return getDataElem(2, "origin"); }
 Value* Ext::callvalue() { return getDataElem(3, "callvalue"); }
@@ -243,7 +242,6 @@ using namespace dev::eth::jit;
 EXPORT void ext_init(ExtData* _extData)
 {
 	auto&& ext = Runtime::getExt();
-	_extData->address = eth2llvm(fromAddress(ext.myAddress));
 	_extData->caller = eth2llvm(fromAddress(ext.caller));
 	_extData->origin = eth2llvm(fromAddress(ext.origin));
 	_extData->callvalue = eth2llvm(ext.value);
diff --git a/libevmjit/Ext.h b/libevmjit/Ext.h
index 361b6e47e..6d8501d29 100644
--- a/libevmjit/Ext.h
+++ b/libevmjit/Ext.h
@@ -12,15 +12,14 @@ namespace eth
 namespace jit
 {
 
-class Ext : public CompilerHelper
+class Ext : public RuntimeHelper
 {
 public:
-	Ext(llvm::IRBuilder<>& _builder);
+	Ext(RuntimeManager& _runtimeManager);
 
 	llvm::Value* store(llvm::Value* _index);
 	void setStore(llvm::Value* _index, llvm::Value* _value);
 
-	llvm::Value* address();
 	llvm::Value* caller();
 	llvm::Value* origin();
 	llvm::Value* callvalue();
diff --git a/libevmjit/Runtime.cpp b/libevmjit/Runtime.cpp
index e09db52c9..bf231cc10 100644
--- a/libevmjit/Runtime.cpp
+++ b/libevmjit/Runtime.cpp
@@ -22,7 +22,7 @@ llvm::StructType* RuntimeData::getType()
 	{
 		llvm::Type* elems[] =
 		{
-			Type::i256,
+			llvm::ArrayType::get(Type::i256, _size)
 		};
 		type = llvm::StructType::create(elems, "RuntimeData");
 	}
@@ -36,7 +36,8 @@ Runtime::Runtime(u256 _gas, ExtVMFace& _ext):
 {
 	assert(!g_runtime);
 	g_runtime = this;
-	m_data.gas = eth2llvm(_gas);
+	set(RuntimeData::Gas, _gas);
+	set(RuntimeData::Address, fromAddress(_ext.myAddress));
 }
 
 Runtime::~Runtime()
@@ -44,15 +45,20 @@ Runtime::~Runtime()
 	g_runtime = nullptr;
 }
 
+void Runtime::set(RuntimeData::Index _index, u256 _value)
+{
+	m_data.elems[_index] = eth2llvm(_value);
+}
+
 
 ExtVMFace& Runtime::getExt()
 {
 	return g_runtime->m_ext;
 }
 
-u256 Runtime::getGas()
+u256 Runtime::getGas() const
 {
-	return llvm2eth(m_data.gas);
+	return llvm2eth(m_data.elems[RuntimeData::Gas]);
 }
 
 extern "C" {
@@ -60,12 +66,12 @@ extern "C" {
 	EXPORT i256 mem_returnDataSize;
 }
 
-bytesConstRef Runtime::getReturnData()
+bytesConstRef Runtime::getReturnData() const
 {
 	// TODO: Handle large indexes
 	auto offset = static_cast<size_t>(llvm2eth(mem_returnDataOffset));
 	auto size = static_cast<size_t>(llvm2eth(mem_returnDataSize));
-	return{getMemory().data() + offset, size};
+	return {m_memory.data() + offset, size};
 }
 
 
@@ -85,16 +91,23 @@ llvm::Value* RuntimeManager::getRuntimePtr()
 	return m_builder.CreateLoad(m_dataPtr);
 }
 
+llvm::Value* RuntimeManager::get(RuntimeData::Index _index)
+{
+	llvm::Value* idxList[] = {m_builder.getInt32(0), m_builder.getInt32(0), m_builder.getInt32(_index)};
+	auto ptr = m_builder.CreateInBoundsGEP(getRuntimePtr(), idxList, "dataElemPtr");
+	return m_builder.CreateLoad(ptr);
+}
+
 llvm::Value* RuntimeManager::getGas()
 {
-	auto gasPtr = m_builder.CreateStructGEP(getRuntimePtr(), 0);
-	return m_builder.CreateLoad(gasPtr, "gas");
+	return get(RuntimeData::Gas);
 }
 
 void RuntimeManager::setGas(llvm::Value* _gas)
 {
-	auto gasPtr = m_builder.CreateStructGEP(getRuntimePtr(), 0);
-	m_builder.CreateStore(_gas, gasPtr);
+	llvm::Value* idxList[] = {m_builder.getInt32(0), m_builder.getInt32(0), m_builder.getInt32(RuntimeData::Gas)};
+	auto ptr = m_builder.CreateInBoundsGEP(getRuntimePtr(), idxList, "gasPtr");
+	m_builder.CreateStore(_gas, ptr);
 }
 
 }
diff --git a/libevmjit/Runtime.h b/libevmjit/Runtime.h
index dc617b777..8b2efe8ed 100644
--- a/libevmjit/Runtime.h
+++ b/libevmjit/Runtime.h
@@ -24,9 +24,17 @@ namespace jit
 
 struct RuntimeData
 {
-	static llvm::StructType* getType();
+	enum Index: unsigned
+	{
+		Gas,
+		Address,
+
+		_size
+	};
+
+	i256 elems[_size];
 
-	i256 gas;
+	static llvm::StructType* getType();
 };
 
 using StackImpl = std::vector<i256>;
@@ -46,10 +54,12 @@ public:
 	StackImpl& getStack() { return m_stack; }
 	MemoryImpl& getMemory() { return m_memory; }
 	static ExtVMFace& getExt();
-	u256 getGas();
-	bytesConstRef getReturnData();
+
+	u256 getGas() const;
+	bytesConstRef getReturnData() const;
 
 private:
+	void set(RuntimeData::Index _index, u256 _value);
 
 	/// @internal Must be the first element to asure Runtime* === RuntimeData*
 	RuntimeData m_data;
@@ -65,6 +75,7 @@ public:
 
 	llvm::Value* getRuntimePtr();
 
+	llvm::Value* get(RuntimeData::Index _index);
 	llvm::Value* getGas();
 	void setGas(llvm::Value* _gas);