diff --git a/contracts/SimpleStorage.sol b/contracts/SimpleStorage.sol
index 778d697..622ff5f 100644
--- a/contracts/SimpleStorage.sol
+++ b/contracts/SimpleStorage.sol
@@ -24,7 +24,7 @@ contract SimpleStorage {
 
     uint chainId;
     assembly {
-      chainId := chainid
+      chainId := chainid()
     }
     bytes32 eip712DomainHash = keccak256(
         abi.encode(
@@ -54,4 +54,4 @@ contract SimpleStorage {
 
     set(x);
   }
-}
\ No newline at end of file
+}