diff --git a/ipv6/ptrtd/Makefile b/ipv6/ptrtd/Makefile
index c78451892..9ba0072a7 100644
--- a/ipv6/ptrtd/Makefile
+++ b/ipv6/ptrtd/Makefile
@@ -1,4 +1,4 @@
-# 
+#
 # Copyright (C) 2006-2011 OpenWrt.org
 #
 # This is free software, licensed under the GNU General Public License v2.