diff --git a/xrpl/core/binarycodec/definitions/definitions.json b/xrpl/core/binarycodec/definitions/definitions.json
index 493c49d89..317e1feb7 100644
--- a/xrpl/core/binarycodec/definitions/definitions.json
+++ b/xrpl/core/binarycodec/definitions/definitions.json
@@ -41,7 +41,7 @@
     "PayChannel": 120,
     "Check": 67,
     "DepositPreauth": 112,
-    "NegativeUnl": 78,
+    "NegativeUNL": 78,
     "NFTokenPage": 80,
     "NFTokenOffer": 55,
     "Any": -3,