--- a/crates/evm-coder/procedural/src/solidity_interface.rs
+++ b/crates/evm-coder/procedural/src/solidity_interface.rs
@@ -610,7 +610,7 @@
 		let custom_signature = self.expand_custom_signature();
 		quote! {
 			const #screaming_name_signature: ::evm_coder::custom_signature::SignatureUnit = #custom_signature;
-			const #screaming_name: ::evm_coder::types::bytes4 = {
+			const #screaming_name: ::evm_coder::types::Bytes4 = {
 				let mut sum = ::evm_coder::sha3_const::Keccak256::new();
 				let mut pos = 0;
 				while pos < Self::#screaming_name_signature.len {
@@ -974,7 +974,7 @@
 					#consts
 				)*
 				/// Return this call ERC165 selector
-				pub const fn interface_id() -> ::evm_coder::types::bytes4 {
+				pub const fn interface_id() -> ::evm_coder::types::Bytes4 {
 					let mut interface_id = 0;
 					#(#interface_id)*
 					#(#inline_interface_id)*
@@ -1019,7 +1019,7 @@
 				}
 			}
 			impl #gen_ref ::evm_coder::Call for #call_name #gen_ref {
-				fn parse(method_id: ::evm_coder::types::bytes4, reader: &mut ::evm_coder::abi::AbiReader) -> ::evm_coder::execution::Result<Option<Self>> {
+				fn parse(method_id: ::evm_coder::types::Bytes4, reader: &mut ::evm_coder::abi::AbiReader) -> ::evm_coder::execution::Result<Option<Self>> {
 					use ::evm_coder::abi::AbiRead;
 					match method_id {
 						::evm_coder::ERC165Call::INTERFACE_ID => return Ok(
@@ -1041,7 +1041,7 @@
 			#gen_where
 			{
 				/// Is this contract implements specified ERC165 selector
-				pub fn supports_interface(this: &#name, interface_id: ::evm_coder::types::bytes4) -> bool {
+				pub fn supports_interface(this: &#name, interface_id: ::evm_coder::types::Bytes4) -> bool {
 					interface_id != u32::to_be_bytes(0xffffff) && (
 						interface_id == ::evm_coder::ERC165Call::INTERFACE_ID ||
 						interface_id == Self::interface_id()
--- a/crates/evm-coder/src/abi/impls.rs
+++ b/crates/evm-coder/src/abi/impls.rs
@@ -81,9 +81,9 @@
 	}
 }
 
-impl_abi_type!(bytes4, bytes4, false);
-impl AbiRead for bytes4 {
-	fn abi_read(reader: &mut AbiReader) -> Result<bytes4> {
+impl_abi_type!(Bytes4, bytes4, false);
+impl AbiRead for Bytes4 {
+	fn abi_read(reader: &mut AbiReader) -> Result<Bytes4> {
 		reader.bytes4()
 	}
 }
--- a/crates/evm-coder/src/abi/mod.rs
+++ b/crates/evm-coder/src/abi/mod.rs
@@ -54,7 +54,7 @@
 		}
 	}
 	/// Start reading RLP buffer, parsing first 4 bytes as selector
-	pub fn new_call(buf: &'i [u8]) -> Result<(bytes4, Self)> {
+	pub fn new_call(buf: &'i [u8]) -> Result<(Bytes4, Self)> {
 		if buf.len() < 4 {
 			return Err(Error::Error(ExitError::OutOfOffset));
 		}
--- a/crates/evm-coder/src/lib.rs
+++ b/crates/evm-coder/src/lib.rs
@@ -132,7 +132,7 @@
 	use primitive_types::{U256, H160, H256};
 
 	pub type Address = H160;
-	pub type bytes4 = [u8; 4];
+	pub type Bytes4 = [u8; 4];
 	pub type topic = H256;
 
 	#[cfg(not(feature = "std"))]
@@ -191,7 +191,7 @@
 /// Parseable EVM call, this trait should be implemented with [`solidity_interface`] macro
 pub trait Call: Sized {
 	/// Parse call buffer into typed call enum
-	fn parse(selector: types::bytes4, input: &mut AbiReader) -> execution::Result<Option<Self>>;
+	fn parse(selector: types::Bytes4, input: &mut AbiReader) -> execution::Result<Option<Self>>;
 }
 
 /// Intended to be used as `#[weight]` output type
@@ -227,22 +227,22 @@
 	/// implements specified interface
 	SupportsInterface {
 		/// Requested interface
-		interface_id: types::bytes4,
+		interface_id: types::Bytes4,
 	},
 }
 
 impl ERC165Call {
 	/// ERC165 selector is provided by standard
-	pub const INTERFACE_ID: types::bytes4 = u32::to_be_bytes(0x01ffc9a7);
+	pub const INTERFACE_ID: types::Bytes4 = u32::to_be_bytes(0x01ffc9a7);
 }
 
 impl Call for ERC165Call {
-	fn parse(selector: types::bytes4, input: &mut AbiReader) -> execution::Result<Option<Self>> {
+	fn parse(selector: types::Bytes4, input: &mut AbiReader) -> execution::Result<Option<Self>> {
 		if selector != Self::INTERFACE_ID {
 			return Ok(None);
 		}
 		Ok(Some(Self::SupportsInterface {
-			interface_id: types::bytes4::abi_read(input)?,
+			interface_id: types::Bytes4::abi_read(input)?,
 		}))
 	}
 }
--- a/crates/evm-coder/src/solidity/impls.rs
+++ b/crates/evm-coder/src/solidity/impls.rs
@@ -27,7 +27,7 @@
 	u64 => "uint64" true = "0",
 	u128 => "uint128" true = "0",
 	U256 => "uint256" true = "0",
-	bytes4 => "bytes4" true = "bytes4(0)",
+	Bytes4 => "bytes4" true = "bytes4(0)",
 	H160 => "address" true = "0x0000000000000000000000000000000000000000",
 	string => "string" false = "\"\"",
 	bytes => "bytes" false = "hex\"\"",
--- a/crates/evm-coder/src/solidity/mod.rs
+++ b/crates/evm-coder/src/solidity/mod.rs
@@ -360,7 +360,7 @@
 
 pub struct SolidityInterface<F: SolidityFunctions> {
 	pub docs: &'static [&'static str],
-	pub selector: bytes4,
+	pub selector: Bytes4,
 	pub name: &'static str,
 	pub is: &'static [&'static str],
 	pub functions: F,