diff --git a/library/sha256.c b/library/sha256.c
index 10d3ff5..1c200c8 100644
--- a/library/sha256.c
+++ b/library/sha256.c
@@ -59,7 +59,7 @@
 {
     SHA256_VALIDATE( ctx != NULL );
 
-    mbedtls_platform_memset( ctx, 0, sizeof( mbedtls_sha256_context ) );
+    memset( ctx, 0, sizeof( mbedtls_sha256_context ) );
 }
 
 void mbedtls_sha256_free( mbedtls_sha256_context *ctx )