diff --git a/src/protocol.js b/src/protocol.js
index 3a249dc..80de4ee 100644
--- a/src/protocol.js
+++ b/src/protocol.js
@@ -136,7 +136,7 @@ var packets = {
       ]},
       animation:          {id: 0x0b, fields: [
         { name: "entityId", type: "varint" },
-        { name: "animation", type: "byte" }
+        { name: "animation", type: "ubyte" }
       ]},
       named_entity_spawn:       {id: 0x0c, fields: [
         { name: "entityId", type: "varint" },