diff --git a/src/vnet/adj/rewrite.h b/src/vnet/adj/rewrite.h
index 42b982e..58d47e0 100644
--- a/src/vnet/adj/rewrite.h
+++ b/src/vnet/adj/rewrite.h
@@ -131,7 +131,7 @@
   ASSERT ((data_bytes >= 0) && (data_bytes < max_size));
 
   rw->data_bytes = data_bytes;
-  clib_memcpy (rw->data + max_size - data_bytes, data, data_bytes);
+  clib_memcpy_fast (rw->data + max_size - data_bytes, data, data_bytes);
   clib_memset (rw->data, 0xfe, max_size - data_bytes);
 }