diff --git a/yesod/scaffold/project.cabal.cg b/yesod/scaffold/project.cabal.cg
index 0da6cdc4..3109b5ed 100644
--- a/yesod/scaffold/project.cabal.cg
+++ b/yesod/scaffold/project.cabal.cg
@@ -25,8 +25,12 @@ library
         Buildable: True
     else
         Buildable: False
-    exposed-modules: Application
+
+    if os(windows)
+        cpp-options: -DWINDOWS
+
     hs-source-dirs: .
+    exposed-modules: Application
     other-modules:   Foundation
                      Model
                      Settings