diff --git a/MANIFEST.in b/MANIFEST.in
index d6618e1b8..04ce10827 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,5 +1,4 @@
 include MANIFEST.in
-include dmoj/cptbox/_cptbox.pyx
 include dmoj/cptbox/*.cpp
 include dmoj/cptbox/*.h
 include dmoj/cptbox/syscalls/aliases.list
@@ -11,9 +10,8 @@ include dmoj/wbox/dmsec32.dll
 include dmoj/wbox/dmsec64.dll
 include dmoj/wbox/getaddr32.exe
 include dmoj/wbox/getaddr64.exe
-include dmoj/wbox/_wbox.pyx
 include dmoj/wbox/*.cpp
 include dmoj/wbox/*.h
 
-exclude dmoj/cptbox/_cptbox.cpp
-exclude dmoj/cptbox/_wbox.cpp
+exclude dmoj/cptbox/_cptbox.pyx
+exclude dmoj/wbox/_wbox.pyx
diff --git a/setup.py b/setup.py
index 960a882f7..e4d1948ca 100644
--- a/setup.py
+++ b/setup.py
@@ -16,13 +16,17 @@
 from setuptools.command import build_ext
 from setuptools.command.build_ext import build_ext as build_ext_old
 
+has_pyx = os.path.exists(os.path.join(os.path.dirname(__file__), 'dmoj', 'cptbox', '_cptbox.pyx'))
+
 try:
     from Cython.Build import cythonize
 except ImportError:
-    print('You need to install cython first before installing DMOJ.', file=sys.stderr)
-    print('Run: pip install cython', file=sys.stderr)
-    print('Or if you do not have pip: easy_install cython', file=sys.stderr)
-    sys.exit(1)
+    if has_pyx:
+        print('You need to install cython first before installing DMOJ.', file=sys.stderr)
+        print('Run: pip install cython', file=sys.stderr)
+        print('Or if you do not have pip: easy_install cython', file=sys.stderr)
+        sys.exit(1)
+    cythonize = lambda x: x
 
 
 class build_ext_dmoj(build_ext_old):
@@ -64,16 +68,21 @@ def unavailable(self, e):
 cptbox_sources = ['_cptbox.pyx', 'helper.cpp', 'ptdebug.cpp', 'ptdebug_x86.cpp', 'ptdebug_x64.cpp',
                   'ptdebug_x86_on_x64.cpp', 'ptdebug_x32.cpp', 'ptdebug_arm.cpp', 'ptproc.cpp']
 
+if not has_pyx:
+    wbox_sources[0] = wbox_sources[0].replace('.pyx', '.cpp')
+    cptbox_sources[0] = cptbox_sources[0].replace('.pyx', '.cpp')
+
 SOURCE_DIR = os.path.dirname(__file__)
 wbox_sources = [os.path.join(SOURCE_DIR, 'dmoj', 'wbox', f) for f in wbox_sources]
 cptbox_sources = [os.path.join(SOURCE_DIR, 'dmoj', 'cptbox', f) for f in cptbox_sources]
 
 extensions = [Extension('dmoj.checkers._checker', sources=['dmoj/checkers/_checker.c'])]
-if os.name == 'nt':
+if os.name == 'nt' or 'sdist' in sys.argv:
     extensions += [Extension('dmoj.wbox._wbox', sources=wbox_sources, language='c++',
                              libraries=['netapi32', 'advapi32', 'ole32'],
                              define_macros=[('UNICODE', None)])]
-else:
+
+if os.name != 'nt' or 'sdist' in sys.argv:
     libs = ['rt']
     if sys.platform.startswith('freebsd'):
         libs += ['procstat']
@@ -90,7 +99,7 @@ def unavailable(self, e):
 
 setup(
     name='dmoj',
-    version='0.1',
+    version='1.0.0',
     packages=find_packages(),
     package_data={
         'dmoj.cptbox': ['syscalls/aliases.list', 'syscalls/*.tbl'],