diff --git a/GUIDELINES.md b/GUIDELINES.md
index 1dd606ddd25..71f16640524 100644
--- a/GUIDELINES.md
+++ b/GUIDELINES.md
@@ -114,6 +114,13 @@ In addition to the official Solidity Style Guide we have a number of other conve
   interface IERC777 {
   ```
 
+* Contracts not intended to be used standalone should be marked abstract
+  so they are required to be inherited to other contracts.
+
+  ```solidity
+  abstract contract AccessControl is ..., {
+  ```
+
 * Unchecked arithmetic blocks should contain comments explaining why overflow is guaranteed not to happen. If the reason is immediately apparent from the line above the unchecked block, the comment may be omitted.
 
 * Custom errors should be declared following the [EIP-6093](https://eips.ethereum.org/EIPS/eip-6093) rationale whenever reasonable. Also, consider the following:
diff --git a/contracts/token/ERC1155/ERC1155.sol b/contracts/token/ERC1155/ERC1155.sol
index 05bcc3fa1bd..61086848958 100644
--- a/contracts/token/ERC1155/ERC1155.sol
+++ b/contracts/token/ERC1155/ERC1155.sol
@@ -17,7 +17,7 @@ import "../../interfaces/draft-IERC6093.sol";
  *
  * _Available since v3.1._
  */
-contract ERC1155 is Context, ERC165, IERC1155, IERC1155MetadataURI, IERC1155Errors {
+abstract contract ERC1155 is Context, ERC165, IERC1155, IERC1155MetadataURI, IERC1155Errors {
     // Mapping from token ID to account balances
     mapping(uint256 => mapping(address => uint256)) private _balances;
 
diff --git a/contracts/token/ERC1155/utils/ERC1155Holder.sol b/contracts/token/ERC1155/utils/ERC1155Holder.sol
index b06a37f1821..d24a1a53a03 100644
--- a/contracts/token/ERC1155/utils/ERC1155Holder.sol
+++ b/contracts/token/ERC1155/utils/ERC1155Holder.sol
@@ -13,7 +13,7 @@ import "./ERC1155Receiver.sol";
  *
  * @dev _Available since v3.1._
  */
-contract ERC1155Holder is ERC1155Receiver {
+abstract contract ERC1155Holder is ERC1155Receiver {
     function onERC1155Received(
         address,
         address,
diff --git a/contracts/token/ERC20/ERC20.sol b/contracts/token/ERC20/ERC20.sol
index dd46c15dd4a..aacfe79b752 100644
--- a/contracts/token/ERC20/ERC20.sol
+++ b/contracts/token/ERC20/ERC20.sol
@@ -35,7 +35,7 @@ import "../../interfaces/draft-IERC6093.sol";
  * functions have been added to mitigate the well-known issues around setting
  * allowances. See {IERC20-approve}.
  */
-contract ERC20 is Context, IERC20, IERC20Metadata, IERC20Errors {
+abstract contract ERC20 is Context, IERC20, IERC20Metadata, IERC20Errors {
     mapping(address => uint256) private _balances;
 
     mapping(address => mapping(address => uint256)) private _allowances;
diff --git a/contracts/token/ERC721/ERC721.sol b/contracts/token/ERC721/ERC721.sol
index 08f660a29fa..a26255c7c72 100644
--- a/contracts/token/ERC721/ERC721.sol
+++ b/contracts/token/ERC721/ERC721.sol
@@ -16,7 +16,7 @@ import "../../interfaces/draft-IERC6093.sol";
  * the Metadata extension, but not including the Enumerable extension, which is available separately as
  * {ERC721Enumerable}.
  */
-contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Errors {
+abstract contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Errors {
     using Strings for uint256;
 
     // Token name
diff --git a/contracts/token/ERC721/utils/ERC721Holder.sol b/contracts/token/ERC721/utils/ERC721Holder.sol
index 9f5b2e9f9df..a3ee8b5f0ca 100644
--- a/contracts/token/ERC721/utils/ERC721Holder.sol
+++ b/contracts/token/ERC721/utils/ERC721Holder.sol
@@ -11,7 +11,7 @@ import "../IERC721Receiver.sol";
  * Accepts all token transfers.
  * Make sure the contract is able to use its token with {IERC721-safeTransferFrom}, {IERC721-approve} or {IERC721-setApprovalForAll}.
  */
-contract ERC721Holder is IERC721Receiver {
+abstract contract ERC721Holder is IERC721Receiver {
     /**
      * @dev See {IERC721Receiver-onERC721Received}.
      *
diff --git a/test/token/ERC1155/utils/ERC1155Holder.test.js b/test/token/ERC1155/utils/ERC1155Holder.test.js
index 864e89b5049..8d85416409e 100644
--- a/test/token/ERC1155/utils/ERC1155Holder.test.js
+++ b/test/token/ERC1155/utils/ERC1155Holder.test.js
@@ -1,6 +1,6 @@
 const { BN } = require('@openzeppelin/test-helpers');
 
-const ERC1155Holder = artifacts.require('ERC1155Holder');
+const ERC1155Holder = artifacts.require('$ERC1155Holder');
 const ERC1155 = artifacts.require('$ERC1155');
 
 const { expect } = require('chai');
diff --git a/test/token/ERC721/utils/ERC721Holder.test.js b/test/token/ERC721/utils/ERC721Holder.test.js
index 0fd82228035..4aa2b79484b 100644
--- a/test/token/ERC721/utils/ERC721Holder.test.js
+++ b/test/token/ERC721/utils/ERC721Holder.test.js
@@ -1,6 +1,6 @@
 const { expect } = require('chai');
 
-const ERC721Holder = artifacts.require('ERC721Holder');
+const ERC721Holder = artifacts.require('$ERC721Holder');
 const ERC721 = artifacts.require('$ERC721');
 
 contract('ERC721Holder', function (accounts) {