diff --git a/library/sha1.c b/library/sha1.c
index 372c0c1..b301b09 100644
--- a/library/sha1.c
+++ b/library/sha1.c
@@ -1,7 +1,7 @@
 /*
  *  FIPS-180-1 compliant SHA-1 implementation
  *
- *  Copyright (C) 2006-2010, Brainspark B.V.
+ *  Copyright (C) 2006-2013, Brainspark B.V.
  *
  *  This file is part of PolarSSL (http://www.polarssl.org)
  *  Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
@@ -38,6 +38,8 @@
 #include <stdio.h>
 #endif
 
+#if !defined(POLARSSL_SHA1_ALT)
+
 /*
  * 32-bit integer manipulation macros (big endian)
  */
@@ -309,6 +311,8 @@
     PUT_UINT32_BE( ctx->state[4], output, 16 );
 }
 
+#endif /* !POLARSSL_SHA1_ALT */
+
 /*
  * output = SHA-1( input buffer )
  */