diff --git a/setup.cfg b/setup.cfg
index 0df7ca4..dbdfcfa 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -64,13 +64,13 @@ usb =
 serial =
     pyserial
 cups =
-    pycups
+    pycups; platform_system!='Windows'
 win32 =
     pywin32; platform_system=='Windows'
 all =
     pyusb>=1.0.0
     pyserial
-    pycups
+    pycups; platform_system!='Windows'
     pywin32; platform_system=='Windows'
 
 [flake8]