Fix website url to use https.
diff --git a/include/polarssl/debug.h b/include/polarssl/debug.h
index 0ba3668..6393c75 100644
--- a/include/polarssl/debug.h
+++ b/include/polarssl/debug.h
@@ -5,7 +5,7 @@
*
* Copyright (C) 2006-2011, ARM Limited, All Rights Reserved
*
- * This file is part of mbed TLS (http://www.polarssl.org)
+ * This file is part of mbed TLS (https://www.polarssl.org)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by