diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,9 @@
+# ChangeLog for wai-handler-launch
+
+## 3.0.3.1
+
+* Fix compilation on Windows
+
 ## 3.0.3
 
 * Add `runHostPortFullUrl` to allow launching arbitrary URLs [#2](https://github.com/yesodweb/wai-handlers/pull/2)
diff --git a/Network/Wai/Handler/Launch.hs b/Network/Wai/Handler/Launch.hs
--- a/Network/Wai/Handler/Launch.hs
+++ b/Network/Wai/Handler/Launch.hs
@@ -172,7 +172,7 @@
 launch :: String -> IO ()
 
 #if WINDOWS
-launch url = withCString url $ launch' url
+launch url = withCString url launch'
 #else
 launch url = forkIO (rawSystem
 #if MAC
diff --git a/wai-handler-launch.cabal b/wai-handler-launch.cabal
--- a/wai-handler-launch.cabal
+++ b/wai-handler-launch.cabal
@@ -1,5 +1,5 @@
 Name:                wai-handler-launch
-Version:             3.0.3
+Version:             3.0.3.1
 Synopsis:            Launch a web app in the default browser.
 description:         API docs and the README are available at <http://www.stackage.org/package/wai-handler-launch>.
 License:             MIT