diff --git a/2021/day16/day16_rs/src/main.rs b/2021/day16/day16_rs/src/main.rs
index 0f4e01d..104b08d 100644
--- a/2021/day16/day16_rs/src/main.rs
+++ b/2021/day16/day16_rs/src/main.rs
@@ -7,7 +7,7 @@ use std::{
 
 use nom::{
     bits::complete as bits,
-    multi::{many0, many_m_n},
+    multi::{many0, many_m_n}, Offset,
 };
 use nom::{combinator::map, sequence::pair};
 use parsers::fold_till;
@@ -99,7 +99,8 @@ impl PacketType {
                 let (subpackets_end, subpackets) = many0(Packet::parse)(subpackets_input)?;
 
                 let new_input = (&i.0[new_byte_offset..], new_bit_offset);
-                assert_eq!(subpackets_end, new_input);
+                assert_eq!(i.0.offset(subpackets_end.0), i.0.offset(new_input.0));
+                assert_eq!(subpackets_end.1, new_input.1);
 
                 Ok((
                     new_input,