diff --git a/scripts/boxesserver b/scripts/boxesserver
index dc0b29a..f52fccf 100755
--- a/scripts/boxesserver
+++ b/scripts/boxesserver
@@ -40,7 +40,7 @@ import wsgiref.util
 try:
     import boxes.generators
 except ImportError:
-    sys.path.append(os.path.dirname(__file__) + "/..")
+    sys.path.append(os.path.join(os.path.dirname(__file__), ".."))
     import boxes.generators
 
 class FileChecker(threading.Thread):