diff --git a/beacon_chain/utils/ssz/src/encode.rs b/beacon_chain/utils/ssz/src/encode.rs
index 905541e2f..42ea0b27e 100644
--- a/beacon_chain/utils/ssz/src/encode.rs
+++ b/beacon_chain/utils/ssz/src/encode.rs
@@ -1,5 +1,3 @@
-#![allow(unknown_lints)]
-
 use super::{
     LENGTH_BYTES
 };
@@ -80,10 +78,9 @@ pub fn encode_length(len: usize, length_bytes: usize) -> Vec<u8> {
     assert!(length_bytes > 0);  // For sanity
     assert!((len as usize) < 2usize.pow(length_bytes as u32 * 8));
     let mut header: Vec<u8> = vec![0; length_bytes];
-    #[allow(needless_range_loop)]
-    for i in 0..length_bytes {
+    for (i, header_byte) in header.iter_mut().enumerate() {
         let offset = (length_bytes - i - 1) * 8;
-        header[i] = ((len >> offset) & 0xff) as u8;
+        *header_byte = ((len >> offset) & 0xff) as u8;
     };
     header
 }