diff --git a/lib/protocol.js b/lib/protocol.js
index c882a22..6d3148c 100644
--- a/lib/protocol.js
+++ b/lib/protocol.js
@@ -93,7 +93,7 @@ var packets = {
   0x0e: [
     { name: "status", type: "byte" },
     { name: "x", type: "int" },
-    { name: "y", type: "byte" },
+    { name: "y", type: "ubyte" },
     { name: "z", type: "int" },
     { name: "face", type: "ubyte" }
   ],
@@ -114,7 +114,7 @@ var packets = {
     { name: "entityId", type: "int" },
     { name: null, type: "byte" },
     { name: "x", type: "int" },
-    { name: "y", type: "byte" },
+    { name: "y", type: "ubyte" },
     { name: "z", type: "int" }
   ],
   0x12: [
@@ -265,7 +265,7 @@ var packets = {
   ],
   0x35: [
     { name: "x", type: "int" },
-    { name: "y", type: "byte" },
+    { name: "y", type: "ubyte" },
     { name: "z", type: "int" },
     { name: "type", type: "short" },
     { name: "metadata", type: "byte" }
@@ -301,7 +301,7 @@ var packets = {
   0x3d: [
     { name: "effectId", type: "int" },
     { name: "x", type: "int" },
-    { name: "y", type: "byte" },
+    { name: "y", type: "ubyte" },
     { name: "z", type: "int" },
     { name: "data", type: "int" },
     { name: "global", type: "bool" }