diff --git a/contracts/base/SBTUpgradeable.sol b/contracts/base/SBTUpgradeable.sol
index 0b29433e..9c1eecda 100644
--- a/contracts/base/SBTUpgradeable.sol
+++ b/contracts/base/SBTUpgradeable.sol
@@ -120,7 +120,7 @@ contract SBTUpgradeable is
   /**
    * @dev See {IERC721-safeTransferFrom}.
    */
- function transferFrom(
+  function transferFrom(
     address from,
     address to,
     uint256 tokenId
@@ -147,7 +147,7 @@ contract SBTUpgradeable is
    *
    * Emits a {Transfer} event.
    */
- function _safeTransfer(
+  function _safeTransfer(
     address from,
     address to,
     uint256 tokenId,