diff --git a/__init__.py b/__init__.py
index 1bba1e2..c89cec3 100644
--- a/__init__.py
+++ b/__init__.py
@@ -4,4 +4,4 @@
 from .xanim import Anim
 from .sanim import SiegeAnim
 
-version = (0, 2, 0)  # Version specifier for PyCoD
+version = (0, 2, 1)  # Version specifier for PyCoD
diff --git a/_lz4.py b/_lz4.py
index 2fd22eb..254e515 100644
--- a/_lz4.py
+++ b/_lz4.py
@@ -12,8 +12,15 @@
     except ImportError:
         xrange = range
 
-        def byte2int(_bytes):
-            return ord(_bytes[0])
+        # If we're running Python 3 or newer, we must
+        #  define byte2int differently than with Python 2
+        import sys
+        if sys.version_info[0] >= 3:
+            import operator
+            byte2int = operator.itemgetter(0)
+        else:
+            def byte2int(_bytes):
+                return ord(_bytes[0])
 
     class CorruptError(Exception):
         pass
@@ -122,7 +129,10 @@ def compress(data):
 else:
     # Use python-lz4 if present
     __support_mode__ = 'python-lz4'
-    compress = lz4.block.compress
+
+    def compress(data):
+        return lz4.block.compress(data, store_size=False)
+
     uncompress = lz4.block.decompress
 
 support_info = 'LZ4: Using %s' % __support_mode__
diff --git a/xbin.py b/xbin.py
index 4724e6b..38ea600 100644
--- a/xbin.py
+++ b/xbin.py
@@ -323,8 +323,9 @@ def WriteMetaVec4Block(file, _hash, vec):
 
     @staticmethod
     def WriteCommentBlock(file, comment):
-        comment = bytearray(comment.encode('utf-8'))
-        data = struct.pack('Hxx%ds' % (len(comment) + 1), 0xC355, comment)
+        comment = __str_packable__(comment)
+        padded_size = padded(len(comment) + 1)
+        data = struct.pack('Hxx%ds' % padded_size, 0xC355, comment)
         file.write(data)
 
     @staticmethod
@@ -458,7 +459,7 @@ def WritePartInfo(file, index, name):
 
     @staticmethod
     def WritePartIndex(file, index):
-        data = struct.pack('Hh', 0x745A, index)
+        data = struct.pack('Hh', 0x745A, int(index))
         file.write(data)
 
     @staticmethod
@@ -468,12 +469,12 @@ def WriteFramerate(file, framerate):
 
     @staticmethod
     def WriteFrameCount(file, frame_count):
-        data = struct.pack('Hxxi', 0xB917, frame_count)
+        data = struct.pack('Hxxi', 0xB917, int(frame_count))
         file.write(data)
 
     @staticmethod
     def WriteFrameIndex(file, frame):
-        data = struct.pack('Hxxi', 0xC723, frame)
+        data = struct.pack('Hxxi', 0xC723, int(frame))
         file.write(data)
 
     @staticmethod