diff --git a/ethcore/res/ethereum/frontier.json b/ethcore/res/ethereum/frontier.json
index be473237c..b951973f8 100644
--- a/ethcore/res/ethereum/frontier.json
+++ b/ethcore/res/ethereum/frontier.json
@@ -134,7 +134,8 @@
 				"eip155Transition": "0x7fffffffffffffff",
 				"eip160Transition": "0x7fffffffffffffff",
 				"eip161abcTransition": "0x7fffffffffffffff",
-				"eip161dTransition": "0x7fffffffffffffff"
+				"eip161dTransition": "0x7fffffffffffffff",
+				"maxCodeSize": 24576
 			}
 		}
 	},
diff --git a/ethcore/src/client/test_client.rs b/ethcore/src/client/test_client.rs
index 434edd3e8..ea220fb1c 100644
--- a/ethcore/src/client/test_client.rs
+++ b/ethcore/src/client/test_client.rs
@@ -315,7 +315,7 @@ pub fn get_temp_state_db() -> GuardedTempResult<StateDB> {
 
 impl MiningBlockChainClient for TestBlockChainClient {
 	fn latest_schedule(&self) -> Schedule {
-		Schedule::new_post_eip150(true, true, true)
+		Schedule::new_post_eip150(24576, true, true, true)
 	}
 
 	fn prepare_open_block(&self, author: Address, gas_range_target: (U256, U256), extra_data: Bytes) -> OpenBlock {
diff --git a/ethcore/src/engines/instant_seal.rs b/ethcore/src/engines/instant_seal.rs
index 75fae4d81..3dc78d1a2 100644
--- a/ethcore/src/engines/instant_seal.rs
+++ b/ethcore/src/engines/instant_seal.rs
@@ -55,7 +55,7 @@ impl Engine for InstantSeal {
 	}
 
 	fn schedule(&self, _env_info: &EnvInfo) -> Schedule {
-		Schedule::new_post_eip150(false, false, false)
+		Schedule::new_post_eip150(usize::max_value(), false, false, false)
 	}
 
 	fn is_sealer(&self, _author: &Address) -> Option<bool> { Some(true) }
diff --git a/ethcore/src/ethereum/ethash.rs b/ethcore/src/ethereum/ethash.rs
index 6436e3531..de2a85942 100644
--- a/ethcore/src/ethereum/ethash.rs
+++ b/ethcore/src/ethereum/ethash.rs
@@ -73,7 +73,9 @@ pub struct EthashParams {
 	/// Number of first block where ECIP-1010 begins.
 	pub ecip1010_pause_transition: u64,
 	/// Number of first block where ECIP-1010 ends.
-	pub ecip1010_continue_transition: u64
+	pub ecip1010_continue_transition: u64,
+	/// Maximum amount of code that can be deploying into a contract.
+	pub max_code_size: u64,
 }
 
 impl From<ethjson::spec::EthashParams> for EthashParams {
@@ -87,19 +89,20 @@ impl From<ethjson::spec::EthashParams> for EthashParams {
 			block_reward: p.block_reward.into(),
 			registrar: p.registrar.map_or_else(Address::new, Into::into),
 			homestead_transition: p.homestead_transition.map_or(0, Into::into),
-			dao_hardfork_transition: p.dao_hardfork_transition.map_or(0x7fffffffffffffff, Into::into),
+			dao_hardfork_transition: p.dao_hardfork_transition.map_or(u64::max_value(), Into::into),
 			dao_hardfork_beneficiary: p.dao_hardfork_beneficiary.map_or_else(Address::new, Into::into),
 			dao_hardfork_accounts: p.dao_hardfork_accounts.unwrap_or_else(Vec::new).into_iter().map(Into::into).collect(),
-			difficulty_hardfork_transition: p.difficulty_hardfork_transition.map_or(0x7fffffffffffffff, Into::into),
+			difficulty_hardfork_transition: p.difficulty_hardfork_transition.map_or(u64::max_value(), Into::into),
 			difficulty_hardfork_bound_divisor: p.difficulty_hardfork_bound_divisor.map_or(p.difficulty_bound_divisor.into(), Into::into),
-			bomb_defuse_transition: p.bomb_defuse_transition.map_or(0x7fffffffffffffff, Into::into),
+			bomb_defuse_transition: p.bomb_defuse_transition.map_or(u64::max_value(), Into::into),
 			eip150_transition: p.eip150_transition.map_or(0, Into::into),
 			eip155_transition: p.eip155_transition.map_or(0, Into::into),
 			eip160_transition: p.eip160_transition.map_or(0, Into::into),
 			eip161abc_transition: p.eip161abc_transition.map_or(0, Into::into),
-			eip161d_transition: p.eip161d_transition.map_or(0x7fffffffffffffff, Into::into),
-			ecip1010_pause_transition: p.ecip1010_pause_transition.map_or(0x7fffffffffffffff, Into::into),
-			ecip1010_continue_transition: p.ecip1010_continue_transition.map_or(0x7fffffffffffffff, Into::into),
+			eip161d_transition: p.eip161d_transition.map_or(u64::max_value(), Into::into),
+			ecip1010_pause_transition: p.ecip1010_pause_transition.map_or(u64::max_value(), Into::into),
+			ecip1010_continue_transition: p.ecip1010_continue_transition.map_or(u64::max_value(), Into::into),
+			max_code_size: p.max_code_size.map_or(u64::max_value(), Into::into),
 		}
 	}
 }
@@ -152,6 +155,7 @@ impl Engine for Ethash {
 			Schedule::new_homestead()
 		} else {
 			Schedule::new_post_eip150(
+				self.ethash_params.max_code_size as usize,
 				env_info.number >= self.ethash_params.eip160_transition,
 				env_info.number >= self.ethash_params.eip161abc_transition,
 				env_info.number >= self.ethash_params.eip161d_transition
diff --git a/ethcore/src/evm/schedule.rs b/ethcore/src/evm/schedule.rs
index b68f6acb5..773708956 100644
--- a/ethcore/src/evm/schedule.rs
+++ b/ethcore/src/evm/schedule.rs
@@ -70,6 +70,8 @@ pub struct Schedule {
 	pub quad_coeff_div: usize,
 	/// Cost for contract length when executing `CREATE`
 	pub create_data_gas: usize,
+	/// Maximum code size when creating a contract.
+	pub create_data_limit: usize,
 	/// Transaction cost
 	pub tx_gas: usize,
 	/// `CREATE` transaction cost
@@ -111,7 +113,7 @@ impl Schedule {
 	}
 
 	/// Schedule for the post-EIP-150-era of the Ethereum main net.
-	pub fn new_post_eip150(fix_exp: bool, no_empty: bool, kill_empty: bool) -> Schedule {
+	pub fn new_post_eip150(max_code_size: usize, fix_exp: bool, no_empty: bool, kill_empty: bool) -> Schedule {
 		Schedule {
 			exceptional_failed_code_deposit: true,
 			have_delegate_call: true,
@@ -139,6 +141,7 @@ impl Schedule {
 			memory_gas: 3,
 			quad_coeff_div: 512,
 			create_data_gas: 200,
+			create_data_limit: max_code_size,
 			tx_gas: 21000,
 			tx_create_gas: 53000,
 			tx_data_zero_gas: 4,
@@ -183,6 +186,7 @@ impl Schedule {
 			memory_gas: 3,
 			quad_coeff_div: 512,
 			create_data_gas: 200,
+			create_data_limit: usize::max_value(),
 			tx_gas: 21000,
 			tx_create_gas: tcg,
 			tx_data_zero_gas: 4,
diff --git a/ethcore/src/externalities.rs b/ethcore/src/externalities.rs
index df1b64e67..3704ead67 100644
--- a/ethcore/src/externalities.rs
+++ b/ethcore/src/externalities.rs
@@ -242,7 +242,7 @@ impl<'a, T, V> Ext for Externalities<'a, T, V> where T: 'a + Tracer, V: 'a + VMT
 			},
 			OutputPolicy::InitContract(ref mut copy) => {
 				let return_cost = U256::from(data.len()) * U256::from(self.schedule.create_data_gas);
-				if return_cost > *gas {
+				if return_cost > *gas || data.len() > self.schedule.create_data_limit {
 					return match self.schedule.exceptional_failed_code_deposit {
 						true => Err(evm::Error::OutOfGas),
 						false => Ok(*gas)
diff --git a/ethcore/src/tests/helpers.rs b/ethcore/src/tests/helpers.rs
index 96d5f8366..adfb4f096 100644
--- a/ethcore/src/tests/helpers.rs
+++ b/ethcore/src/tests/helpers.rs
@@ -433,18 +433,19 @@ pub fn get_default_ethash_params() -> EthashParams{
 		block_reward: U256::from(0),
 		registrar: "0000000000000000000000000000000000000001".into(),
 		homestead_transition: 1150000,
-		dao_hardfork_transition: 0x7fffffffffffffff,
+		dao_hardfork_transition: u64::max_value(),
 		dao_hardfork_beneficiary: "0000000000000000000000000000000000000001".into(),
 		dao_hardfork_accounts: vec![],
-		difficulty_hardfork_transition: 0x7fffffffffffffff,
+		difficulty_hardfork_transition: u64::max_value(),
 		difficulty_hardfork_bound_divisor: U256::from(0),
-		bomb_defuse_transition: 0x7fffffffffffffff,
-		eip150_transition: 0x7fffffffffffffff,
-		eip155_transition: 0x7fffffffffffffff,
-		eip160_transition: 0x7fffffffffffffff,
-		eip161abc_transition: 0x7fffffffffffffff,
-		eip161d_transition: 0x7fffffffffffffff,
-		ecip1010_pause_transition: 0x7fffffffffffffff,
-		ecip1010_continue_transition: 0x7fffffffffffffff
+		bomb_defuse_transition: u64::max_value(),
+		eip150_transition: u64::max_value(),
+		eip155_transition: u64::max_value(),
+		eip160_transition: u64::max_value(),
+		eip161abc_transition: u64::max_value(),
+		eip161d_transition: u64::max_value(),
+		ecip1010_pause_transition: u64::max_value(),
+		ecip1010_continue_transition: u64::max_value(),
+		max_code_size: u64::max_value(),
 	}
 }
diff --git a/json/src/spec/ethash.rs b/json/src/spec/ethash.rs
index 10f0c6293..752d6853e 100644
--- a/json/src/spec/ethash.rs
+++ b/json/src/spec/ethash.rs
@@ -92,6 +92,11 @@ pub struct EthashParams {
 	/// See main EthashParams docs.
 	#[serde(rename="ecip1010ContinueTransition")]
 	pub ecip1010_continue_transition: Option<Uint>,
+
+	/// See main EthashParams docs.
+	#[serde(rename="maxCodeSize")]
+	pub max_code_size: Option<Uint>,
+
 }
 
 /// Ethash engine deserialization.