diff --git a/rust/worker/src/blockstore/positional_posting_list_value.rs b/rust/worker/src/blockstore/positional_posting_list_value.rs
index 5cddeb36044..f6d92c9e59c 100644
--- a/rust/worker/src/blockstore/positional_posting_list_value.rs
+++ b/rust/worker/src/blockstore/positional_posting_list_value.rs
@@ -20,7 +20,7 @@ impl PositionalPostingList {
     }
 
     pub(crate) fn get_positions_for_doc_id(&self, doc_id: i32) -> Option<Int32Array> {
-        let index = self.doc_ids.iter().position(|x| x == Some(doc_id));
+        let index = self.doc_ids.values().binary_search(&doc_id).ok();
         match index {
             Some(index) => {
                 let target_positions = self.positions.value(index);