diff --git a/src/lib/parse/LibParseError.sol b/src/lib/parse/LibParseError.sol
index 9a1e7e518..d2db90f53 100644
--- a/src/lib/parse/LibParseError.sol
+++ b/src/lib/parse/LibParseError.sol
@@ -3,11 +3,14 @@ pragma solidity ^0.8.18;
 
 import {ParseState} from "./LibParseState.sol";
 
+bytes32 constant MAGIC_NUMBER_RAIN_PARSE_ERROR_V1 = keccak256("rain.interpreter.error.parse.0") << 0x10;
+
 library LibParseError {
     function parseErrorOffset(ParseState memory state, uint256 cursor) internal pure returns (uint256 offset) {
         bytes memory data = state.data;
+        bytes32 magicNumber = MAGIC_NUMBER_RAIN_PARSE_ERROR_V1;
         assembly ("memory-safe") {
-            offset := sub(cursor, add(data, 0x20))
+            offset := or(magicNumber, sub(cursor, add(data, 0x20)))
         }
     }
 }