diff --git a/library/sha256.c b/library/sha256.c
index 3ecacc0..785e28b 100644
--- a/library/sha256.c
+++ b/library/sha256.c
@@ -527,7 +527,7 @@
 
         if( j == 2 )
         {
-            mbedtls_platform_memset( buf, 'a', buflen = 1000 );
+            memset( buf, 'a', buflen = 1000 );
 
             for( j = 0; j < 1000; j++ )
             {