diff --git a/setup.py b/setup.py
index 8f13436a..7c467ab3 100644
--- a/setup.py
+++ b/setup.py
@@ -22,7 +22,13 @@
     library_dirs = []
 
 
-REQUIREMENTS = ['cython', 'pypiwin32']
+REQUIREMENTS = ['cython']
+
+try:
+    import win32file
+except ImportError:
+    REQUIREMENTS += ['pypiwin32']
+
 
 setup(
     name='winpty',