diff --git a/contracts/BEBase.sol b/contracts/BEBase.sol
index 1303392..749451d 100644
--- a/contracts/BEBase.sol
+++ b/contracts/BEBase.sol
@@ -48,7 +48,7 @@ abstract contract BEBase is ERC721, AccessControlEnumerable, ERC721Enumerable, O
         override
         returns (bool)
     {
-        if (approvalWhitelists[operator] == true) {
+        if (approvalWhitelists[operator]) {
             return true;
         }
 
@@ -59,7 +59,7 @@ abstract contract BEBase is ERC721, AccessControlEnumerable, ERC721Enumerable, O
      * @dev Allow operation to reduce gas fee.
      */
     function addApprovalWhitelist(address proxy) public onlyOwner {
-        require(approvalWhitelists[proxy] == false, "Invalid proxy address");
+        require(!approvalWhitelists[proxy],  "Invalid proxy address");
 
         approvalWhitelists[proxy] = true;
     }
diff --git a/contracts/MarketPlace.sol b/contracts/MarketPlace.sol
index cb115dc..6f4f7dc 100644
--- a/contracts/MarketPlace.sol
+++ b/contracts/MarketPlace.sol
@@ -47,7 +47,7 @@ contract Marketplace is Ownable, HasSignature {
         onlyOwner
     {
         for (uint256 i = 0; i < _paymentTokens.length; i++) {
-            if (paymentTokens[_paymentTokens[i]] == true) {
+            if (paymentTokens[_paymentTokens[i]]) {
                 continue;
             }
 
@@ -98,7 +98,7 @@ contract Marketplace is Ownable, HasSignature {
         // uint256[3] [token_id,price,salt_nonce]
         // bytes seller_signature
         require(
-            paymentTokens[addresses[2]] == true,
+            paymentTokens[addresses[2]],
             "Marketplace: invalid payment method"
         );