diff --git a/l1-contracts/contracts/bridge/L1SharedBridge.sol b/l1-contracts/contracts/bridge/L1SharedBridge.sol
index fa10e8e7f..6d89fb5cb 100644
--- a/l1-contracts/contracts/bridge/L1SharedBridge.sol
+++ b/l1-contracts/contracts/bridge/L1SharedBridge.sol
@@ -37,10 +37,10 @@ contract L1SharedBridge is IL1SharedBridge, ReentrancyGuard, Ownable2StepUpgrade
     IBridgehub public immutable override BRIDGE_HUB;
 
     /// @dev Era's chainID
-    uint256 immutable ERA_CHAIN_ID;
+    uint256 internal immutable ERA_CHAIN_ID;
 
     /// @dev The address of zkSync Era diamond proxy contract.
-    address immutable ERA_DIAMOND_PROXY;
+    address internal immutable ERA_DIAMOND_PROXY;
 
     /// @dev Stores the first batch number on the zkSync Era Diamond Proxy that was settled after Diamond proxy upgrade.
     /// This variable is used to differentiate between pre-upgrade and post-upgrade Eth withdrawals. Withdrawals from batches older
diff --git a/l1-contracts/contracts/state-transition/ValidatorTimelock.sol b/l1-contracts/contracts/state-transition/ValidatorTimelock.sol
index d793783d6..bf3688b4a 100644
--- a/l1-contracts/contracts/state-transition/ValidatorTimelock.sol
+++ b/l1-contracts/contracts/state-transition/ValidatorTimelock.sol
@@ -52,7 +52,7 @@ contract ValidatorTimelock is IExecutor, Ownable2Step {
     uint32 public executionDelay;
 
     /// @dev Era's chainID
-    uint256 immutable ERA_CHAIN_ID;
+    uint256 internal immutable ERA_CHAIN_ID;
 
     constructor(address _initialOwner, uint32 _executionDelay, uint256 _eraChainId) {
         _transferOwnership(_initialOwner);
diff --git a/l1-contracts/contracts/state-transition/chain-deps/facets/Mailbox.sol b/l1-contracts/contracts/state-transition/chain-deps/facets/Mailbox.sol
index 752913b3f..a84457853 100644
--- a/l1-contracts/contracts/state-transition/chain-deps/facets/Mailbox.sol
+++ b/l1-contracts/contracts/state-transition/chain-deps/facets/Mailbox.sol
@@ -34,7 +34,7 @@ contract MailboxFacet is ZkSyncHyperchainBase, IMailbox {
     string public constant override getName = "MailboxFacet";
 
     /// @dev Era's chainID
-    uint256 immutable ERA_CHAIN_ID;
+    uint256 internal immutable ERA_CHAIN_ID;
 
     constructor(uint256 _eraChainId) {
         ERA_CHAIN_ID = _eraChainId;
diff --git a/l2-contracts/contracts/bridge/L2SharedBridge.sol b/l2-contracts/contracts/bridge/L2SharedBridge.sol
index 82c5bc615..4a8886815 100644
--- a/l2-contracts/contracts/bridge/L2SharedBridge.sol
+++ b/l2-contracts/contracts/bridge/L2SharedBridge.sol
@@ -37,7 +37,7 @@ contract L2SharedBridge is IL2SharedBridge, Initializable {
 
     /// @dev Contract is expected to be used as proxy implementation.
     /// @dev Disable the initialization to prevent Parity hack.
-    uint256 immutable ERA_CHAIN_ID;
+    uint256 internal immutable ERA_CHAIN_ID;
 
     constructor(uint256 _eraChainId) {
         ERA_CHAIN_ID = _eraChainId;