diff --git a/protocol/protocol.json b/protocol/protocol.json
index add3f1c..c626b61 100644
--- a/protocol/protocol.json
+++ b/protocol/protocol.json
@@ -2605,7 +2605,7 @@
         "fields": [
           {
             "name": "windowId",
-            "type": "byte"
+            "type": "ubyte"
           }
         ]
       },
@@ -2614,7 +2614,7 @@
         "fields": [
           {
             "name": "windowId",
-            "type": "byte"
+            "type": "ubyte"
           },
           {
             "name": "slot",