Unable to compile contract, TypeError: "Type int_const 18 is not implicitly convertible to expected type string storage ref. decimals = 18;"

Support Contracts
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Unable to successfully compile (Truffle Compile), the following error appears when I run command in VS CODE TypeError: Type int_const 18 is not implicitly convertible to expected type string storage ref.
decimals = 18;

:1234: Code to reproduce

pragma solidity ^0.5.0;

import "@openzeppelin/contracts/token/ERC20/ERC20Mintable.sol";

contract DaiTokenMock is ERC20Mintable {

    string public name;

    string public symbol;

    string public decimals;

constructor() public {

    name = "Dai Stablecoin (DAI)";

    symbol = "DAI";

    decimals = 18;

}

}

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#### 💻 Environment
truffle v.5.0.5
Node v12.19.0