diff --git a/README.md b/README.md
index a8d168b..7409cb0 100644
--- a/README.md
+++ b/README.md
@@ -168,7 +168,7 @@ Where elementList is an array with the following structure:
 
 ```js
 [
-  { uuid_msb: 123, uuid_lsb: 456, amount: 0.5, operation: 1 },
+  { uuid: [ 123, 456, 78, 90 ], amount: 0.5, operation: 1 },
   ...
 ]
 ```
diff --git a/lib/protocol.js b/lib/protocol.js
index d212f37..3293312 100644
--- a/lib/protocol.js
+++ b/lib/protocol.js
@@ -534,6 +534,7 @@ var types = {
   'byteVector': [readByteVector, writeByteVector, 3],
   'byteVectorArray': [readByteVectorArray, writeByteVectorArray, sizeOfByteVectorArray],
   'stringArray': [readStringArray, writeStringArray, sizeOfStringArray],
+  'UUID': [readUUID, writeUUID, 16],
   'propertyArray': [readPropertyArray, writePropertyArray, sizeOfPropertyArray]
 };
 
@@ -730,14 +731,22 @@ function writeStringArray(value, buffer, offset) {
 function sizeOfPropertyArray(value) {
   var size = 4;
   for (var i = 0; i < value.length; ++i) {
-    size += sizeOfString(value[i].key) + types['double'][2];
+    size += sizeOfString(value[i].key) + types['double'][2] + types['short'][2];
     for (var j = 0; j < value[i].elementList.length; j++) {
-      size += types['long'][2] + types['long'][2] + types['double'][2] + types['byte'][2];
+      size += types['UUID'][2] + types['double'][2] + types['byte'][2];
     }
   }
   return size;
 }
 
+function writeUUID(value, buffer, offset) {
+  buffer.writeInt32BE(value[0], offset);
+  buffer.writeInt32BE(value[1], offset + 4);
+  buffer.writeInt32BE(value[2], offset + 8);
+  buffer.writeInt32BE(value[3], offset + 12);
+  return offset + 16;
+}
+
 function writePropertyArray(value, buffer, offset) {
   buffer.writeInt32BE(value.length, offset);
   offset += 4;
@@ -746,8 +755,7 @@ function writePropertyArray(value, buffer, offset) {
     offset = writeDouble(value[i].value, buffer, offset);
     offset = writeShort(value[i].elementList.length, buffer, offset);
     for (var j = 0; j < value[i].elementList.length; j++) {
-      offset = writeLong(value[i].elementList[j].uuid_msb, buffer, offset);
-      offset = writeLong(value[i].elementList[j].uuid_lsb, buffer, offset);
+      offset = writeUUID(value[i].elementList[j].uuid, buffer, offset);
       offset = writeDouble(value[i].elementList[j].amount, buffer, offset);
       offset = writeByte(value[i].elementList[j].operation, buffer, offset);
     }
@@ -1058,6 +1066,19 @@ function readStringArray (buffer, offset) {
   };
 }
 
+function readUUID(buffer, offset) {
+  if (offset + 16 > buffer.length) return null;
+  return {
+    value: [
+      buffer.readInt32BE(offset),
+      buffer.readInt32BE(offset + 4),
+      buffer.readInt32BE(offset + 8),
+      buffer.readInt32BE(offset + 12),
+    ],
+    size: 16,
+  };
+}
+
 function readPropertyArray (buffer, offset) {
   var results = readInt(buffer, offset);
   if (! results) return null;
@@ -1088,14 +1109,9 @@ function readPropertyArray (buffer, offset) {
     for (var j = 0; j < elementListLength ; j++) {
       property.elementList[j] = {}
 
-      results = readLong(buffer, cursor);
+      results = readUUID(buffer, cursor);
       if (! results) return null;
-      property.elementList[j].uuid_msb = results.value;
-      cursor += results.size;
-
-      results = readLong(buffer, cursor);
-      if (! results) return null;
-      property.elementList[j].uuid_lsb = results.value;
+      property.elementList[j].uuid = results.value;
       cursor += results.size;
 
       results = readDouble(buffer, cursor);
diff --git a/test/test.js b/test/test.js
index b18bb2d..e18a36f 100644
--- a/test/test.js
+++ b/test/test.js
@@ -72,7 +72,7 @@ var values = {
     nbtData: new Buffer(0),
   }],
   'stringArray': ['hello', 'dude'],
-  'propertyArray': [{ key: 'generic.maxHealth', value: 1.5 }],
+  'propertyArray': [{ key: 'generic.maxHealth', value: 1.5, elementList: [ { uuid: [ 123, 456, 78, 90 ], amount: 0.5, operation: 1 } ] }],
   'mapChunkBulk': {
     skyLightSent: true,
     compressedChunkData: new Buffer(1234),