diff --git a/include/polarssl/sha1.h b/include/polarssl/sha1.h
index 7d44c67..5748fa4 100644
--- a/include/polarssl/sha1.h
+++ b/include/polarssl/sha1.h
@@ -1,8 +1,8 @@
 /**
  * \file sha1.h
  */
-#ifndef XYSSL_SHA1_H
-#define XYSSL_SHA1_H
+#ifndef POLARSSL_SHA1_H
+#define POLARSSL_SHA1_H
 
 /**
  * \brief          SHA-1 context structure