diff --git a/include/polarssl/cipher_wrap.h b/include/polarssl/cipher_wrap.h
index 5df8174..e81c11d 100644
--- a/include/polarssl/cipher_wrap.h
+++ b/include/polarssl/cipher_wrap.h
@@ -5,7 +5,7 @@
  *
  * \author Adriaan de Jong <dejong@fox-it.com>
  *
- *  Copyright (C) 2006-2011, Brainspark B.V.
+ *  Copyright (C) 2006-2012, Brainspark B.V.
  *
  *  This file is part of PolarSSL (http://www.polarssl.org)
  *  Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
@@ -84,6 +84,10 @@
 
 #endif /* defined(POLARSSL_DES_C) */
 
+#if defined(POLARSSL_CIPHER_NULL_CIPHER)
+extern const cipher_info_t null_cipher_info;
+#endif /* defined(POLARSSL_CIPHER_NULL_CIPHER) */
+
 #ifdef __cplusplus
 }
 #endif