diff --git a/src/mito2/src/memtable/time_series.rs b/src/mito2/src/memtable/time_series.rs
index 5b6dd7958564..0289d932cd70 100644
--- a/src/mito2/src/memtable/time_series.rs
+++ b/src/mito2/src/memtable/time_series.rs
@@ -410,7 +410,6 @@ impl Iterator for Iter {
             self.metrics.total_series += 1;
 
             let mut series = series.write().unwrap();
-            let start = Instant::now();
             if !self.predicate.is_empty()
                 && !prune_primary_key(
                     &self.codec,