diff --git a/include/polarssl/md2.h b/include/polarssl/md2.h
index c303483..3952940 100644
--- a/include/polarssl/md2.h
+++ b/include/polarssl/md2.h
@@ -1,8 +1,8 @@
 /**
  * \file md2.h
  */
-#ifndef XYSSL_MD2_H
-#define XYSSL_MD2_H
+#ifndef POLARSSL_MD2_H
+#define POLARSSL_MD2_H
 
 /**
  * \brief          MD2 context structure