diff --git a/library/sha512.c b/library/sha512.c
index 648735b..504e30d 100644
--- a/library/sha512.c
+++ b/library/sha512.c
@@ -585,7 +585,7 @@
 
         if( j == 2 )
         {
-            mbedtls_platform_memset( buf, 'a', buflen = 1000 );
+            memset( buf, 'a', buflen = 1000 );
 
             for( j = 0; j < 1000; j++ )
             {