diff --git a/eth2/types/src/beacon_state/slot_processing.rs b/eth2/types/src/beacon_state/slot_processing.rs
index ab5311d21..9501083f0 100644
--- a/eth2/types/src/beacon_state/slot_processing.rs
+++ b/eth2/types/src/beacon_state/slot_processing.rs
@@ -47,8 +47,9 @@ impl BeaconState {
         let mut result = None;
         for slot in self.get_current_epoch_boundaries(spec.epoch_length) {
             for (committee, shard) in self.get_crosslink_committees_at_slot(slot, spec)? {
-                if let Some(committee_index) = committee.iter().find(|i| **i == validator_index) {
-                    result = Some(Ok((slot, shard, *committee_index as u64)));
+                if let Some(committee_index) = committee.iter().position(|&i| i == validator_index)
+                {
+                    result = Some(Ok((slot, shard, committee_index as u64)));
                 }
             }
         }