diff --git a/test/webserver.js b/test/webserver.js
index d8cd3055b..2d84d37ad 100644
--- a/test/webserver.js
+++ b/test/webserver.js
@@ -85,6 +85,10 @@ WebServer.prototype = {
       // `/../../../../../../../etc/passwd`, which let you make GET requests
       // for files outside of `this.root`.
       var pathPart = path.normalize(decodeURI(urlParts[1]));
+      // path.normalize returns a path on the basis of the current platform.
+      // Windows paths cause issues in statFile and serverDirectoryIndex.
+      // Converting to unix path would avoid platform checks in said functions.
+      pathPart = pathPart.replace(/\\/g, '/');
     } catch (ex) {
       // If the URI cannot be decoded, a `URIError` is thrown. This happens for
       // malformed URIs such as `http://localhost:8888/%s%s` and should be