diff --git a/library/md.c b/library/md.c
index c54ae85..303cdcb 100644
--- a/library/md.c
+++ b/library/md.c
@@ -33,7 +33,7 @@
 
 #include "mbedtls/md.h"
 #include "mbedtls/md_internal.h"
-#include "mbedtls/utils.h"
+#include "mbedtls/platform_util.h"
 
 #if defined(MBEDTLS_PLATFORM_C)
 #include "mbedtls/platform.h"
@@ -189,11 +189,12 @@
 
     if( ctx->hmac_ctx != NULL )
     {
-        mbedtls_zeroize( ctx->hmac_ctx, 2 * ctx->md_info->block_size );
+        mbedtls_platform_zeroize( ctx->hmac_ctx,
+                                  2 * ctx->md_info->block_size );
         mbedtls_free( ctx->hmac_ctx );
     }
 
-    mbedtls_zeroize( ctx, sizeof( mbedtls_md_context_t ) );
+    mbedtls_platform_zeroize( ctx, sizeof( mbedtls_md_context_t ) );
 }
 
 int mbedtls_md_clone( mbedtls_md_context_t *dst,
@@ -307,7 +308,7 @@
         ret = md_info->finish_func( ctx.md_ctx, output );
 
 cleanup:
-    mbedtls_zeroize( buf, sizeof( buf ) );
+    mbedtls_platform_zeroize( buf, sizeof( buf ) );
     fclose( f );
     mbedtls_md_free( &ctx );
 
@@ -357,7 +358,7 @@
         goto cleanup;
 
 cleanup:
-    mbedtls_zeroize( sum, sizeof( sum ) );
+    mbedtls_platform_zeroize( sum, sizeof( sum ) );
 
     return( ret );
 }