diff --git a/library/sha512.c b/library/sha512.c
index 2366e7c..1bef2e9 100644
--- a/library/sha512.c
+++ b/library/sha512.c
@@ -1,7 +1,7 @@
 /*
  *  FIPS-180-2 compliant SHA-384/512 implementation
  *
- *  Copyright (C) 2006-2013, Brainspark B.V.
+ *  Copyright (C) 2006-2014, Brainspark B.V.
  *
  *  This file is part of PolarSSL (http://www.polarssl.org)
  *  Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
@@ -38,6 +38,12 @@
 #include <stdio.h>
 #endif
 
+#if defined(POLARSSL_PLATFORM_C)
+#include "polarssl/platform.h"
+#else
+#define polarssl_printf printf
+#endif
+
 #if !defined(POLARSSL_SHA512_ALT)
 
 /*
@@ -681,7 +687,7 @@
         k = i < 3;
 
         if( verbose != 0 )
-            printf( "  SHA-%d test #%d: ", 512 - k * 128, j + 1 );
+            polarssl_printf( "  SHA-%d test #%d: ", 512 - k * 128, j + 1 );
 
         sha512_starts( &ctx, k );
 
@@ -701,17 +707,17 @@
         if( memcmp( sha512sum, sha512_test_sum[i], 64 - k * 16 ) != 0 )
         {
             if( verbose != 0 )
-                printf( "failed\n" );
+                polarssl_printf( "failed\n" );
 
             return( 1 );
         }
 
         if( verbose != 0 )
-            printf( "passed\n" );
+            polarssl_printf( "passed\n" );
     }
 
     if( verbose != 0 )
-        printf( "\n" );
+        polarssl_printf( "\n" );
 
     for( i = 0; i < 14; i++ )
     {
@@ -719,7 +725,7 @@
         k = i < 7;
 
         if( verbose != 0 )
-            printf( "  HMAC-SHA-%d test #%d: ", 512 - k * 128, j + 1 );
+            polarssl_printf( "  HMAC-SHA-%d test #%d: ", 512 - k * 128, j + 1 );
 
         if( j == 5 || j == 6 )
         {
@@ -740,17 +746,17 @@
         if( memcmp( sha512sum, sha512_hmac_test_sum[i], buflen ) != 0 )
         {
             if( verbose != 0 )
-                printf( "failed\n" );
+                polarssl_printf( "failed\n" );
 
             return( 1 );
         }
 
         if( verbose != 0 )
-            printf( "passed\n" );
+            polarssl_printf( "passed\n" );
     }
 
     if( verbose != 0 )
-        printf( "\n" );
+        polarssl_printf( "\n" );
 
     return( 0 );
 }