diff --git a/common/cython_hacks.py b/common/cython_hacks.py
deleted file mode 100644
index d0e154746..000000000
--- a/common/cython_hacks.py
+++ /dev/null
@@ -1,23 +0,0 @@
-import os
-import sysconfig
-from Cython.Distutils import build_ext
-
-def get_ext_filename_without_platform_suffix(filename):
-  name, ext = os.path.splitext(filename)
-  ext_suffix = sysconfig.get_config_var('EXT_SUFFIX')
-
-  if ext_suffix == ext:
-    return filename
-
-  ext_suffix = ext_suffix.replace(ext, '')
-  idx = name.find(ext_suffix)
-
-  if idx == -1:
-    return filename
-  else:
-    return name[:idx] + ext
-
-class BuildExtWithoutPlatformSuffix(build_ext):
-  def get_ext_filename(self, ext_name):
-    filename = super().get_ext_filename(ext_name)
-    return get_ext_filename_without_platform_suffix(filename)
diff --git a/release/files_common b/release/files_common
index 527c87be6..902242bcd 100644
--- a/release/files_common
+++ b/release/files_common
@@ -36,7 +36,6 @@ common/filter_simple.py
 common/stat_live.py
 common/spinner.py
 common/text_window.py
-common/cython_hacks.py
 common/SConscript
 
 common/kalman/.gitignore
diff --git a/tools/lib/lazy_property.py b/tools/lib/lazy_property.py
deleted file mode 100644
index 85c038f28..000000000
--- a/tools/lib/lazy_property.py
+++ /dev/null
@@ -1,12 +0,0 @@
-class lazy_property(object):
-  """Defines a property whose value will be computed only once and as needed.
-
-     This can only be used on instance methods.
-  """
-  def __init__(self, func):
-    self._func = func
-
-  def __get__(self, obj_self, cls):
-    value = self._func(obj_self)
-    setattr(obj_self, self._func.__name__, value)
-    return value