diff --git a/src/precompiles/ArbDebug.sol b/src/precompiles/ArbDebug.sol
index 01ee127a..8f895454 100644
--- a/src/precompiles/ArbDebug.sol
+++ b/src/precompiles/ArbDebug.sol
@@ -41,6 +41,12 @@ interface ArbDebug {
 
     function legacyError() external pure;
 
+    // emulates the same behaviour
+    function emulateRevertPackingOutput() external view returns (uint8);
+
+    // reverts packaging output
+    function revertPackingOutput() external view returns (uint8);
+
     error Custom(uint64, string, bool);
     error Unused();
 }