diff --git a/tbxi/bootinfo_build.py b/tbxi/bootinfo_build.py
index 689e00a..fdcb559 100644
--- a/tbxi/bootinfo_build.py
+++ b/tbxi/bootinfo_build.py
@@ -2,6 +2,11 @@ from os import path
 import re
 import zlib
 
+try:
+    from .fast_lzss import compress
+except ImportError:
+    from .slow_lzss import compress
+
 from . import dispatcher
 
 
@@ -47,7 +52,7 @@ def build(src):
         constants[base + '-offset'] = len(booter)
         for attempt in ['MacROM', 'Parcels']:
             try:
-                booter.extend(dispatcher.build_path(path.join(src, attempt)))
+                data = dispatcher.build_path(path.join(src, attempt))
             except:
                 pass
             else:
@@ -55,6 +60,9 @@ def build(src):
         else:
             raise FileNotFoundError
 
+        if not data.startswith(b'prcl'): data = compress(data)
+        booter.extend(data)
+
         constants[base + '-size'] = len(booter) - constants[base + '-offset']
 
     constants['info-size'] = len(booter)