diff --git a/setup.py b/setup.py
index 97210e70..aa1174b4 100644
--- a/setup.py
+++ b/setup.py
@@ -24,9 +24,10 @@
     zip_safe=False,
     install_requires=[
         "packaging",
-        "twisted>=17.9",
+        "pywin32;platform_system=='Windows'",
         "scrapy>=2.0.0",
         "setuptools",
+        "twisted>=17.9",
         "w3lib",
         "zope.interface",
     ],