diff --git a/packages/protocol/contracts/L1/TaikoCustomErrors.sol b/packages/protocol/contracts/L1/TaikoCustomErrors.sol
new file mode 100644
index 00000000000..dfc7ebf8ebf
--- /dev/null
+++ b/packages/protocol/contracts/L1/TaikoCustomErrors.sol
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: MIT
+//  _____     _ _         _         _
+// |_   _|_ _(_) |_____  | |   __ _| |__ ___
+//   | |/ _` | | / / _ \ | |__/ _` | '_ (_-<
+//   |_|\__,_|_|_\_\___/ |____\__,_|_.__/__/
+
+pragma solidity ^0.8.9;
+
+/// @author david <david@taiko.xyz>
+abstract contract TaikoCustomErrors {
+    // The following custom errors must match the definitions in other V1 libraries.
+    error L1_0_FEE_BASE();
+    error L1_ANCHOR_CALLDATA();
+    error L1_ANCHOR_DEST();
+    error L1_ANCHOR_GAS_LIMIT();
+    error L1_ANCHOR_RECEIPT_ADDR();
+    error L1_ANCHOR_RECEIPT_DATA();
+    error L1_ANCHOR_RECEIPT_LOGS();
+    error L1_ANCHOR_RECEIPT_PROOF();
+    error L1_ANCHOR_RECEIPT_STATUS();
+    error L1_ANCHOR_RECEIPT_TOPICS();
+    error L1_ANCHOR_SIG_R();
+    error L1_ANCHOR_SIG_S();
+    error L1_ANCHOR_TYPE();
+    error L1_BLOCK_NUMBER();
+    error L1_CANNOT_BE_FIRST_PROVER();
+    error L1_CIRCUIT_LENGTH();
+    error L1_COMMITTED();
+    error L1_CONFLICT_PROOF();
+    error L1_DUP_PROVERS();
+    error L1_EXTRA_DATA();
+    error L1_GAS_LIMIT();
+    error L1_HALTED();
+    error L1_HALT_CONDITION();
+    error L1_ID();
+    error L1_INPUT_SIZE();
+    error L1_METADATA_FIELD();
+    error L1_META_MISMATCH();
+    error L1_NOT_COMMITTED();
+    error L1_NOT_FIRST_PROVER();
+    error L1_PROOF_LENGTH();
+    error L1_PROVER();
+    error L1_SOLO_PROPOSER();
+    error L1_TOO_LATE();
+    error L1_TOO_MANY();
+    error L1_TOO_MANY_PROVERS();
+    error L1_TX_LIST();
+    error L1_ZKP();
+}
diff --git a/packages/protocol/contracts/L1/TaikoL1.sol b/packages/protocol/contracts/L1/TaikoL1.sol
index 7d9ddf55b7a..ef7441bd6ab 100644
--- a/packages/protocol/contracts/L1/TaikoL1.sol
+++ b/packages/protocol/contracts/L1/TaikoL1.sol
@@ -12,6 +12,7 @@ import "../libs/LibAnchorSignature.sol";
 import "../libs/LibSharedConfig.sol";
 import "./TaikoData.sol";
 import "./TaikoEvents.sol";
+import "./TaikoCustomErrors.sol";
 import "./libs/LibProposing.sol";
 import "./libs/LibProving.sol";
 import "./libs/LibUtils.sol";
@@ -20,7 +21,12 @@ import "./libs/LibVerifying.sol";
 /**
  * @author dantaik <dan@taiko.xyz>
  */
-contract TaikoL1 is EssentialContract, IHeaderSync, TaikoEvents {
+contract TaikoL1 is
+    EssentialContract,
+    IHeaderSync,
+    TaikoEvents,
+    TaikoCustomErrors
+{
     using LibUtils for TaikoData.State;
 
     TaikoData.State public state;