diff --git a/contracts/introspection/ERC165Checker.sol b/contracts/introspection/ERC165Checker.sol
index d8788c477..8653da53a 100644
--- a/contracts/introspection/ERC165Checker.sol
+++ b/contracts/introspection/ERC165Checker.sol
@@ -47,7 +47,7 @@ library ERC165Checker {
      *
      * See `IERC165.supportsInterface`.
      */
-     function _supportsAllInterfaces(address account, bytes4[] memory interfaceIds) internal view returns (bool) {
+    function _supportsAllInterfaces(address account, bytes4[] memory interfaceIds) internal view returns (bool) {
         // query support of ERC165 itself
         if (!_supportsERC165(account)) {
             return false;
diff --git a/contracts/token/ERC777/ERC777.sol b/contracts/token/ERC777/ERC777.sol
index 9038e8039..1df96220a 100644
--- a/contracts/token/ERC777/ERC777.sol
+++ b/contracts/token/ERC777/ERC777.sol
@@ -348,7 +348,7 @@ contract ERC777 is IERC777, IERC20 {
         bytes memory operatorData,
         bool requireReceptionAck
     )
-    private
+        private
     {
         require(from != address(0), "ERC777: send from the zero address");
         require(to != address(0), "ERC777: send to the zero address");
@@ -375,7 +375,7 @@ contract ERC777 is IERC777, IERC20 {
         bytes memory data,
         bytes memory operatorData
     )
-    private
+        private
     {
         require(from != address(0), "ERC777: burn from the zero address");
 
@@ -433,7 +433,7 @@ contract ERC777 is IERC777, IERC20 {
         bytes memory userData,
         bytes memory operatorData
     )
-    private
+        private
     {
         address implementer = _erc1820.getInterfaceImplementer(from, TOKENS_SENDER_INTERFACE_HASH);
         if (implementer != address(0)) {
@@ -461,7 +461,7 @@ contract ERC777 is IERC777, IERC20 {
         bytes memory operatorData,
         bool requireReceptionAck
     )
-    private
+        private
     {
         address implementer = _erc1820.getInterfaceImplementer(to, TOKENS_RECIPIENT_INTERFACE_HASH);
         if (implementer != address(0)) {
diff --git a/contracts/token/ERC777/IERC777Recipient.sol b/contracts/token/ERC777/IERC777Recipient.sol
index c1d47ebae..a46b30a9f 100644
--- a/contracts/token/ERC777/IERC777Recipient.sol
+++ b/contracts/token/ERC777/IERC777Recipient.sol
@@ -10,7 +10,7 @@ pragma solidity ^0.5.0;
  *
  * See `IERC1820Registry` and `ERC1820Implementer`.
  */
- interface IERC777Recipient {
+interface IERC777Recipient {
     /**
      * @dev Called by an `IERC777` token contract whenever tokens are being
      * moved or created into a registered account (`to`). The type of operation