diff --git a/src/standards/ERC1155Standard.ts b/src/standards/ERC1155Standard.ts
index ff6a6dd..636d4ac 100644
--- a/src/standards/ERC1155Standard.ts
+++ b/src/standards/ERC1155Standard.ts
@@ -249,7 +249,7 @@ export class ERC1155Standard {
         .safeBatchTransferFrom(from, to, tokenIds, amounts)
         .estimateGas({ gas: 1000000 });
     }
-    gas = gas * 1.1;
+    gas = (gas * 1.1) | 1;
     if (estimate) {
       return jc.wallet.generateGasShow(gas);
     }
diff --git a/src/standards/ERC20Standard.ts b/src/standards/ERC20Standard.ts
index a0395ec..d380b90 100644
--- a/src/standards/ERC20Standard.ts
+++ b/src/standards/ERC20Standard.ts
@@ -162,7 +162,7 @@ export class ERC20Standard {
         .transfer(to, amountBN)
         .estimateGas({ gas: 1000000 });
     }
-    gas = gas * 1.1;
+    gas = (gas * 1.1) | 1;
     if (estimate) {
       return jc.wallet.generateGasShow(gas);
     }
diff --git a/src/standards/ERC721Standard.ts b/src/standards/ERC721Standard.ts
index 7ec8f3d..399aa3d 100644
--- a/src/standards/ERC721Standard.ts
+++ b/src/standards/ERC721Standard.ts
@@ -307,7 +307,7 @@ export class ERC721Standard {
         .safeTransferFrom(from, to, tokenId)
         .estimateGas({ gas: 1000000 });
     }
-    gas = gas * 1.1;
+    gas = (gas * 1.1) | 1;
     if (estimate) {
       return jc.wallet.generateGasShow(gas);
     }
diff --git a/src/standards/JCStandard.ts b/src/standards/JCStandard.ts
index d79dfb0..cae7a4d 100644
--- a/src/standards/JCStandard.ts
+++ b/src/standards/JCStandard.ts
@@ -169,7 +169,7 @@ export class JCStandard {
     }
     return contract.methods
       .evolve721NFT(nftAddress, tokenIds, startTime, nonce, signature)
-      .send({ gas: (gas * 1.1) | 0 });
+      .send({ gas });
   }
 
   async evolveChip({