--- a/pallets/fungible/src/erc.rs
+++ b/pallets/fungible/src/erc.rs
@@ -135,11 +135,6 @@
 
 		Ok(<Allowance<T>>::get((self.id, owner, spender)).into())
 	}
-
-	/// @notice Returns collection helper contract address
-	fn collection_helper_address(&self) -> Result<Address> {
-		Ok(T::ContractAddress::get())
-	}
 }
 
 #[solidity_interface(name = ERC20Mintable)]
@@ -312,6 +307,11 @@
 			.map_err(dispatch_to_evm::<T>)?;
 		Ok(true)
 	}
+
+	/// @notice Returns collection helper contract address
+	fn collection_helper_address(&self) -> Result<Address> {
+		Ok(T::ContractAddress::get())
+	}
 }
 
 #[solidity_interface(
--- a/pallets/fungible/src/stubs/UniqueFungible.sol
+++ b/pallets/fungible/src/stubs/UniqueFungible.sol
@@ -511,7 +511,7 @@
 	bytes value;
 }
 
-/// @dev the ERC-165 identifier for this interface is 0x7dee5997
+/// @dev the ERC-165 identifier for this interface is 0x65789571
 contract ERC20UniqueExtensions is Dummy, ERC165 {
 	/// @notice A description for the collection.
 	/// @dev EVM selector for this function is: 0x7284e416,
@@ -607,6 +607,15 @@
 		dummy = 0;
 		return false;
 	}
+
+	/// @notice Returns collection helper contract address
+	/// @dev EVM selector for this function is: 0x1896cce6,
+	///  or in textual repr: collectionHelperAddress()
+	function collectionHelperAddress() public view returns (address) {
+		require(false, stub_error);
+		dummy;
+		return 0x0000000000000000000000000000000000000000;
+	}
 }
 
 /// @dev anonymous struct
@@ -637,7 +646,7 @@
 	event Approval(address indexed owner, address indexed spender, uint256 value);
 }
 
-/// @dev the ERC-165 identifier for this interface is 0x8cb847c4
+/// @dev the ERC-165 identifier for this interface is 0x942e8b22
 contract ERC20 is Dummy, ERC165, ERC20Events {
 	/// @dev EVM selector for this function is: 0x06fdde03,
 	///  or in textual repr: name()
@@ -723,15 +732,6 @@
 		spender;
 		dummy;
 		return 0;
-	}
-
-	/// @notice Returns collection helper contract address
-	/// @dev EVM selector for this function is: 0x1896cce6,
-	///  or in textual repr: collectionHelperAddress()
-	function collectionHelperAddress() public view returns (address) {
-		require(false, stub_error);
-		dummy;
-		return 0x0000000000000000000000000000000000000000;
 	}
 }
 
--- a/tests/src/eth/api/UniqueFungible.sol
+++ b/tests/src/eth/api/UniqueFungible.sol
@@ -353,7 +353,7 @@
 	bytes value;
 }
 
-/// @dev the ERC-165 identifier for this interface is 0x7dee5997
+/// @dev the ERC-165 identifier for this interface is 0x65789571
 interface ERC20UniqueExtensions is Dummy, ERC165 {
 	/// @notice A description for the collection.
 	/// @dev EVM selector for this function is: 0x7284e416,
@@ -403,6 +403,11 @@
 		CrossAddress memory to,
 		uint256 amount
 	) external returns (bool);
+
+	/// @notice Returns collection helper contract address
+	/// @dev EVM selector for this function is: 0x1896cce6,
+	///  or in textual repr: collectionHelperAddress()
+	function collectionHelperAddress() external view returns (address);
 }
 
 /// @dev anonymous struct
@@ -427,7 +432,7 @@
 	event Approval(address indexed owner, address indexed spender, uint256 value);
 }
 
-/// @dev the ERC-165 identifier for this interface is 0x8cb847c4
+/// @dev the ERC-165 identifier for this interface is 0x942e8b22
 interface ERC20 is Dummy, ERC165, ERC20Events {
 	/// @dev EVM selector for this function is: 0x06fdde03,
 	///  or in textual repr: name()
@@ -468,11 +473,6 @@
 	/// @dev EVM selector for this function is: 0xdd62ed3e,
 	///  or in textual repr: allowance(address,address)
 	function allowance(address owner, address spender) external view returns (uint256);
-
-	/// @notice Returns collection helper contract address
-	/// @dev EVM selector for this function is: 0x1896cce6,
-	///  or in textual repr: collectionHelperAddress()
-	function collectionHelperAddress() external view returns (address);
 }
 
 interface UniqueFungible is Dummy, ERC165, ERC20, ERC20Mintable, ERC20UniqueExtensions, Collection {}