diff --git a/src/bin/indexer.rs b/src/bin/indexer.rs
index ae0f83767..004f733b3 100644
--- a/src/bin/indexer.rs
+++ b/src/bin/indexer.rs
@@ -21,7 +21,7 @@ use rayon::prelude::*;
 use roaring::RoaringBitmap;
 use structopt::StructOpt;
 
-use milli::heed_codec::{CsvStringRecordCodec, ByteorderXRoaringBitmapCodec};
+use milli::heed_codec::{CsvStringRecordCodec, BoRoaringBitmapCodec};
 use milli::tokenizer::{simple_tokenizer, only_token};
 use milli::{SmallVec32, Index, Position, DocumentId, BEU32};
 
@@ -364,7 +364,7 @@ impl Store {
             key.extend_from_slice(word.as_bytes());
             // We serialize the positions into a buffer.
             let positions = RoaringBitmap::from_iter(positions.iter().cloned());
-            let bytes = ByteorderXRoaringBitmapCodec::bytes_encode(&positions)
+            let bytes = BoRoaringBitmapCodec::bytes_encode(&positions)
                 .with_context(|| format!("could not serialize positions"))?;
             // that we write under the generated key into MTBL
             if lmdb_key_valid_size(&key) {
diff --git a/src/bin/infos.rs b/src/bin/infos.rs
index fc68e6980..831e14110 100644
--- a/src/bin/infos.rs
+++ b/src/bin/infos.rs
@@ -336,13 +336,13 @@ fn average_number_of_words_by_doc(index: &Index, rtxn: &heed::RoTxn) -> anyhow::
 
 fn average_number_of_positions_by_word(index: &Index, rtxn: &heed::RoTxn) -> anyhow::Result<()> {
     use heed::types::DecodeIgnore;
-    use milli::ByteorderXRoaringBitmapCodec;
+    use milli::BoRoaringBitmapCodec;
 
     let mut values_length = Vec::new();
     let mut count = 0;
 
     let db = index.docid_word_positions.as_polymorph();
-    for result in db.iter::<_, DecodeIgnore, ByteorderXRoaringBitmapCodec>(rtxn)? {
+    for result in db.iter::<_, DecodeIgnore, BoRoaringBitmapCodec>(rtxn)? {
         let ((), val) = result?;
         values_length.push(val.len() as u32);
         count += 1;
diff --git a/src/heed_codec/byteorder_x_roaring_bitmap_codec.rs b/src/heed_codec/bo_roaring_bitmap_codec.rs
similarity index 81%
rename from src/heed_codec/byteorder_x_roaring_bitmap_codec.rs
rename to src/heed_codec/bo_roaring_bitmap_codec.rs
index 4f920959e..7ceb69f9a 100644
--- a/src/heed_codec/byteorder_x_roaring_bitmap_codec.rs
+++ b/src/heed_codec/bo_roaring_bitmap_codec.rs
@@ -2,9 +2,9 @@ use std::borrow::Cow;
 use byteorder::{NativeEndian, ReadBytesExt, WriteBytesExt};
 use roaring::RoaringBitmap;
 
-pub struct ByteorderXRoaringBitmapCodec;
+pub struct BoRoaringBitmapCodec;
 
-impl heed::BytesDecode<'_> for ByteorderXRoaringBitmapCodec {
+impl heed::BytesDecode<'_> for BoRoaringBitmapCodec {
     type DItem = RoaringBitmap;
 
     fn bytes_decode(mut bytes: &[u8]) -> Option<Self::DItem> {
@@ -16,7 +16,7 @@ impl heed::BytesDecode<'_> for ByteorderXRoaringBitmapCodec {
     }
 }
 
-impl heed::BytesEncode<'_> for ByteorderXRoaringBitmapCodec {
+impl heed::BytesEncode<'_> for BoRoaringBitmapCodec {
     type EItem = RoaringBitmap;
 
     fn bytes_encode(item: &Self::EItem) -> Option<Cow<[u8]>> {
diff --git a/src/heed_codec/mod.rs b/src/heed_codec/mod.rs
index 3a367dc6f..edae12351 100644
--- a/src/heed_codec/mod.rs
+++ b/src/heed_codec/mod.rs
@@ -1,11 +1,11 @@
 mod beu32_str_codec;
-mod byteorder_x_roaring_bitmap_codec;
+mod bo_roaring_bitmap_codec;
 mod csv_string_record_codec;
 mod roaring_bitmap_codec;
 mod str_str_u8_codec;
 
 pub use self::beu32_str_codec::BEU32StrCodec;
-pub use self::byteorder_x_roaring_bitmap_codec::ByteorderXRoaringBitmapCodec;
+pub use self::bo_roaring_bitmap_codec::BoRoaringBitmapCodec;
 pub use self::csv_string_record_codec::CsvStringRecordCodec;
 pub use self::roaring_bitmap_codec::RoaringBitmapCodec;
 pub use self::str_str_u8_codec::StrStrU8Codec;
diff --git a/src/lib.rs b/src/lib.rs
index 850869064..1bc42928c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -18,7 +18,7 @@ pub use self::search::{Search, SearchResult};
 pub use self::criterion::{Criterion, default_criteria};
 pub use self::heed_codec::{
     RoaringBitmapCodec, BEU32StrCodec, StrStrU8Codec,
-    CsvStringRecordCodec, ByteorderXRoaringBitmapCodec,
+    CsvStringRecordCodec, BoRoaringBitmapCodec,
 };
 
 pub type FastMap4<K, V> = HashMap<K, V, BuildHasherDefault<FxHasher32>>;
@@ -42,7 +42,7 @@ pub struct Index {
     /// A word and all the documents ids containing the word.
     pub word_docids: Database<Str, RoaringBitmapCodec>,
     /// Maps a word and a document id (u32) to all the positions where the given word appears.
-    pub docid_word_positions: Database<BEU32StrCodec, ByteorderXRoaringBitmapCodec>,
+    pub docid_word_positions: Database<BEU32StrCodec, BoRoaringBitmapCodec>,
     /// Maps the proximity between a pair of words with all the docids where this relation appears.
     pub word_pair_proximity_docids: Database<StrStrU8Codec, RoaringBitmapCodec>,
     /// Maps the document id to the document as a CSV line.