diff --git a/frontend/src/components/Dapp.js b/frontend/src/components/Dapp.js
index 32d3f605..cf78fc9d 100644
--- a/frontend/src/components/Dapp.js
+++ b/frontend/src/components/Dapp.js
@@ -345,7 +345,7 @@ export class Dapp extends React.Component {
   }
 
   async _switchChain() {
-    const chainIdHex = `0x${HARDHAT_NETWORK_ID.toString(16)}`
+    const chainIdHex = `0x${parseInt(HARDHAT_NETWORK_ID, 10).toString(16)}`
     await window.ethereum.request({
       method: "wallet_switchEthereumChain",
       params: [{ chainId: chainIdHex }],