diff --git a/milli/src/lib.rs b/milli/src/lib.rs
index b68c76048..ba2bd9b0f 100644
--- a/milli/src/lib.rs
+++ b/milli/src/lib.rs
@@ -74,10 +74,6 @@ pub fn absolute_from_relative_position(field_id: FieldId, relative: RelativePosi
     (field_id as u32) << 16 | (relative as u32)
 }
 
-pub fn field_id_from_position(position: u32) -> FieldId {
-    (position >> 16 & 0xffff) as u16
-}
-
 /// Transform a raw obkv store into a JSON Object.
 pub fn obkv_to_json(
     displayed_fields: &[FieldId],
diff --git a/milli/src/update/index_documents/extract/extract_word_docids.rs b/milli/src/update/index_documents/extract/extract_word_docids.rs
index 5083bbd90..0f8b4c039 100644
--- a/milli/src/update/index_documents/extract/extract_word_docids.rs
+++ b/milli/src/update/index_documents/extract/extract_word_docids.rs
@@ -12,7 +12,7 @@ use super::helpers::{
 use crate::error::SerializationError;
 use crate::index::db_name::DOCID_WORD_POSITIONS;
 use crate::update::index_documents::helpers::read_u32_ne_bytes;
-use crate::{field_id_from_position, FieldId, Result};
+use crate::{relative_from_absolute_position, FieldId, Result};
 
 /// Extracts the word and the documents ids where this word appear.
 ///
@@ -67,7 +67,7 @@ pub fn extract_word_docids<R: io::Read + io::Seek>(
                 if added_to_exact && added_to_word_docids {
                     break;
                 }
-                let fid = field_id_from_position(position);
+                let (fid, _) = relative_from_absolute_position(position);
                 if exact_attributes.contains(&fid) && !added_to_exact {
                     exact_word_docids_sorter.insert(word_bytes, &value_buffer)?;
                     added_to_exact = true;