diff --git a/src/rank/criterion/exact.rs b/src/rank/criterion/exact.rs
index 6d33a6f38..759bd951e 100644
--- a/src/rank/criterion/exact.rs
+++ b/src/rank/criterion/exact.rs
@@ -9,13 +9,13 @@ use crate::database::DatabaseView;
 use crate::Match;
 
 #[inline]
-fn contains_exact(matches: &[Match]) -> bool {
+fn contains_exact(matches: &&[Match]) -> bool {
     matches.iter().any(|m| m.is_exact)
 }
 
 #[inline]
 fn number_exact_matches(matches: &Matches) -> usize {
-    matches.query_index_groups().map(contains_exact).count()
+    matches.query_index_groups().filter(contains_exact).count()
 }
 
 #[derive(Debug, Clone, Copy)]