diff --git a/src/evm/ext.rs b/src/evm/ext.rs
index 7a11412a9..71fcf2696 100644
--- a/src/evm/ext.rs
+++ b/src/evm/ext.rs
@@ -25,7 +25,7 @@ pub trait Ext {
 	/// If contract creation is successfull, return gas_left and contract address,
 	/// If depth is too big or transfer value exceeds balance, return None
 	/// Otherwise return appropriate `Error`.
-	fn create(&mut self, gas: u64, value: &U256, code: &[u8]) -> Result<(u64, Option<Address>), Error>;
+	fn create(&mut self, gas: &U256, value: &U256, code: &[u8]) -> Result<(U256, Option<Address>), Error>;
 
 	/// Message call.
 	/// 
diff --git a/src/evm/jit.rs b/src/evm/jit.rs
index cf7280f70..71789ef2a 100644
--- a/src/evm/jit.rs
+++ b/src/evm/jit.rs
@@ -209,9 +209,9 @@ impl<'a> evmjit::Ext for ExtAdapter<'a> {
 			  init_size: u64,
 			  address: *mut evmjit::H256) {
 		unsafe {
-			match self.ext.create(*io_gas, &U256::from_jit(&*endowment), slice::from_raw_parts(init_beg, init_size as usize)) {
+			match self.ext.create(&U256::from(*io_gas), &U256::from_jit(&*endowment), slice::from_raw_parts(init_beg, init_size as usize)) {
 				Ok((gas_left, opt)) => {
-					*io_gas = gas_left;
+					*io_gas = gas_left.low_u64();
 					*address = match opt {
 						Some(addr) => addr.into_jit(),
 						_ => Address::new().into_jit()
diff --git a/src/evm/tests.rs b/src/evm/tests.rs
index 4a50fcdba..4de68bc37 100644
--- a/src/evm/tests.rs
+++ b/src/evm/tests.rs
@@ -42,7 +42,7 @@ impl Ext for FakeExt {
 		self.blockhashes.get(number).unwrap_or(&H256::new()).clone()
 	}
 
-	fn create(&mut self, _gas: u64, _value: &U256, _code: &[u8]) -> result::Result<(u64, Option<Address>), evm::Error> {
+	fn create(&mut self, _gas: &U256, _value: &U256, _code: &[u8]) -> result::Result<(U256, Option<Address>), evm::Error> {
 		unimplemented!();
 	}
 
diff --git a/src/executive.rs b/src/executive.rs
index da21e35a7..b10baa795 100644
--- a/src/executive.rs
+++ b/src/executive.rs
@@ -349,10 +349,10 @@ impl<'a> Ext for Externalities<'a> {
 		}
 	}
 
-	fn create(&mut self, gas: u64, value: &U256, code: &[u8]) -> Result<(u64, Option<Address>), evm::Error> {
+	fn create(&mut self, gas: &U256, value: &U256, code: &[u8]) -> Result<(U256, Option<Address>), evm::Error> {
 		// if balance is insufficient or we are to deep, return
 		if self.state.balance(&self.params.address) < *value || self.depth >= self.schedule.stack_limit {
-			return Ok((gas, None));
+			return Ok((*gas, None));
 		}
 
 		// create new contract address
@@ -363,7 +363,7 @@ impl<'a> Ext for Externalities<'a> {
 			address: address.clone(),
 			sender: self.params.address.clone(),
 			origin: self.params.origin.clone(),
-			gas: U256::from(gas),
+			gas: *gas,
 			gas_price: self.params.gas_price.clone(),
 			value: value.clone(),
 			code: code.to_vec(),
@@ -372,7 +372,7 @@ impl<'a> Ext for Externalities<'a> {
 
 		let mut ex = Executive::from_parent(self.state, self.info, self.engine, self.depth);
 		ex.state.inc_nonce(&self.params.address);
-		ex.create(&params, self.substate).map(|gas_left| (gas_left.low_u64(), Some(address)))
+		ex.create(&params, self.substate).map(|gas_left| (gas_left, Some(address)))
 	}
 
 	fn call(&mut self, gas: u64, call_gas: u64, receive_address: &Address, value: &U256, data: &[u8], code_address: &Address, output: &mut [u8]) -> Result<u64, evm::Error> {
diff --git a/src/tests/executive.rs b/src/tests/executive.rs
index 5c47939c0..7e2b7ecfd 100644
--- a/src/tests/executive.rs
+++ b/src/tests/executive.rs
@@ -71,7 +71,7 @@ impl<'a> Ext for TestExt<'a> {
 		self.ext.blockhash(number)
 	}
 
-	fn create(&mut self, gas: u64, value: &U256, code: &[u8]) -> Result<(u64, Option<Address>), evm::Error> {
+	fn create(&mut self, gas: &U256, value: &U256, code: &[u8]) -> Result<(U256, Option<Address>), evm::Error> {
 		// in call and create we need to check if we exited with insufficient balance or max limit reached.
 		// in case of reaching max depth, we should store callcreates. Otherwise, ignore.
 		let res = self.ext.create(gas, value, code);
@@ -82,7 +82,7 @@ impl<'a> Ext for TestExt<'a> {
 				self.callcreates.push(CallCreate {
 					data: code.to_vec(),
 					destination: address.clone(),
-					_gas_limit: U256::from(gas),
+					_gas_limit: *gas,
 					value: *value
 				});
 				Ok((gas_left, Some(address)))
@@ -94,7 +94,7 @@ impl<'a> Ext for TestExt<'a> {
 					data: code.to_vec(),
 					// TODO: address is not stored here?
 					destination: Address::new(),
-					_gas_limit: U256::from(gas),
+					_gas_limit: *gas,
 					value: *value
 				});
 				Ok((gas_left, Some(address)))