diff --git a/library/md.c b/library/md.c
index 964d4bd..8c0393b 100644
--- a/library/md.c
+++ b/library/md.c
@@ -346,9 +346,8 @@
 
 #if defined(MBEDTLS_MD_C)
     if (ctx->hmac_ctx != NULL) {
-        mbedtls_platform_zeroize(ctx->hmac_ctx,
+        mbedtls_zeroize_and_free(ctx->hmac_ctx,
                                  2 * ctx->md_info->block_size);
-        mbedtls_free(ctx->hmac_ctx);
     }
 #endif