diff --git a/pyparallel/setup.py b/pyparallel/setup.py
index 64bda13..929277a 100644
--- a/pyparallel/setup.py
+++ b/pyparallel/setup.py
@@ -1,6 +1,16 @@
 #!/usr/bin/env python
 from distutils.core import setup, Extension
 
+import os
+if os.name == 'nt':
+    ext_modules =[
+        Extension('_pyparallel',
+            sources=['src/win32/_pyparallel.c'],
+        )
+    ]
+else:
+    ext_modules = None
+
 setup (name = "pyparallel",
     description="Python Parallel Port Extension",
     version="0.1",
@@ -10,10 +20,5 @@
     packages=['parallel'],
     license="Python",
     long_description="Python Parallel Port Extension for Win32, Linux, BSD",
-
-    ext_modules = [
-        Extension('_pyparallel',
-            sources=['src/win32/_pyparallel.c', 'src/win32/loaddrv.c'],
-        )
-    ]
+    ext_modules = ext_modules
 )