diff --git a/milli/src/update/update_builder.rs b/milli/src/update/update_builder.rs
index 8d6eb034d..c966f72d2 100644
--- a/milli/src/update/update_builder.rs
+++ b/milli/src/update/update_builder.rs
@@ -2,7 +2,7 @@ use grenad::CompressionType;
 use rayon::ThreadPool;
 
 use crate::Index;
-use super::{ClearDocuments, DeleteDocuments, IndexDocuments, Settings, Facets};
+use super::{ClearDocuments, DeleteDocuments, IndexDocuments, Settings, Facets, WordsPrefixes};
 
 pub struct UpdateBuilder<'a> {
     pub(crate) log_every_n: Option<usize>,
@@ -135,4 +135,19 @@ impl<'a> UpdateBuilder<'a> {
 
         builder
     }
+
+    pub fn words_prefixes<'t, 'u, 'i>(
+        self,
+        wtxn: &'t mut heed::RwTxn<'i, 'u>,
+        index: &'i Index,
+    ) -> WordsPrefixes<'t, 'u, 'i>
+    {
+        let mut builder = WordsPrefixes::new(wtxn, index, self.update_id);
+
+        builder.chunk_compression_type = self.chunk_compression_type;
+        builder.chunk_compression_level = self.chunk_compression_level;
+        builder.chunk_fusing_shrink_size = self.chunk_fusing_shrink_size;
+
+        builder
+    }
 }